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Jan H. Jensen

@janhjensen.bsky.social
3K followers 291 following 339 posts

Computational chemist at the University of Copenhagen #compchem

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Jan H. Jensen @janhjensen.bsky.social · 04/10/2026
"So what this study is basically getting at is A: a big chunk of the problem doesn't seem to be whether you use AI tools but when and B: the most neurologically optimal sequence for using them is doing the thinking yourself first and bringing AI in second." youtu.be/MWWpRF4IEZs?...
youtu.be
MIT Says You Risk Cognitive Debt With ChatGPT, but That's Only Half the Story
YouTube video by Dan Grib
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Reposted by Jan H. Jensen
Geoff Hutchison @geoffhutchison.net · 30/09/2026
Some great new #compchem results from my next-door neighbors in the Carter-Fenk group.
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Jan H. Jensen @janhjensen.bsky.social · 27/09/2026
New highlight: Modeling Reaction Feasibility to Identify New Opportunities for Sigmatropic Rearrangements www.compchemhighlights.org/2026/09/mode... #compchem
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Reposted by Jan H. Jensen
Kresten Lindorff-Larsen @lindorfflarsen.bsky.social · 19/09/2026
Ca. 1/10 of randomly perturbed (with a "single-atom change") parent molecules had a >10x increased potency in experimental tests I wonder for how many iterations one could increase affinity in this way?
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Jan H. Jensen @janhjensen.bsky.social · 19/09/2026
source: www.youtube.com/watch?v=Nbwv...
youtube.com
The last IMO problem AI could not solve
YouTube video by 3Blue1Brown
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Jan H. Jensen @janhjensen.bsky.social · 19/09/2026
The same goes for programming.
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Jan H. Jensen @janhjensen.bsky.social · 17/09/2026
. @aligoodfellow.bsky.social presenting his embedder for organometallics at the RDKit UGM in Darmstadt
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Reposted by Jan H. Jensen
Janus Juul Eriksen @januseriksen.bsky.social · 16/09/2026
Deadline on September 25th is approaching soon. Please get your applications in and reach out to me by email beforehand with any questions you might have. RTs are most welcome.
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Reposted by Jan H. Jensen
Jimmy 🇩🇰 🇨🇭 @jimmykromann.bsky.social · 13/09/2026
JavaScript #RDKit 2026.3.6 is published! Going forward, we'll publish a new release automatically. rdkitjs.com still needs to be transferred; until then, you can use rdkit.github.io/rdkit-js/. If things break, please let me know by opening an issue. #chemsky #compchemsky #Cheminformatics
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Jan H. Jensen @janhjensen.bsky.social · 31/08/2026
Great paper! Will do
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Jan H. Jensen @janhjensen.bsky.social · 30/08/2026
New highlight: Rapid Generation of Transition-State Conformer Ensembles via Constrained Distance Geometry www.compchemhighlights.org/2026/08/rapi... #compchem
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Reposted by Jan H. Jensen
Greg Landrum @greglandrum.bsky.social · 18/08/2026
The #RDKit UGM in Darmstadt is almost here (16-18 September), but if you want to attend, we still have some slots available. Free registration here: www.eventbrite.com/e/15th-rdkit...
eventbrite.com
15th RDKit UGM 2026
2026 RDKit User Group Meeting (in person and online)
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Jan H. Jensen @janhjensen.bsky.social · 12/08/2026
Hybrid QM/ML approaches for the prediction of regioselectivity in Minisci C–H functionalisation reactions | ChemRxiv chemrxiv.org/doi/abs/10.2... #compchem
chemrxiv.org
Hybrid QM/ML approaches for the prediction of regioselectivity in Minisci C–H functionalisation reactions | ChemRxiv
Regioselectivity models are of key importance to the implementation of C–H functionalisations in synthetic route planning. In structure- and fragment-based drug discovery (SBDD/FBDD), ligand-target affinity is enhanced by elaborating weak hits into potent ...
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Jan H. Jensen @janhjensen.bsky.social · 12/08/2026
AutoSolvate 2.0: Automated End-to-End Explicit-Solvent Molecular Simulation for Chemically Diverse Molecular Systems | ChemRxiv chemrxiv.org/doi/abs/10.2... #compchem
chemrxiv.org
AutoSolvate 2.0: Automated End-to-End Explicit-Solvent Molecular Simulation for Chemically Diverse Molecular Systems | ChemRxiv
Electronic-structure calculations in solution often require explicit solvent to describe hydrogen bonding, ion pairing, charge transfer, and solvent reorganization. However, preparing explicit-solvent...
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Jan H. Jensen @janhjensen.bsky.social · 11/08/2026
Robust out-of-distribution prediction of Buchwald–Hartwig reactions www.nature.com/articles/s43... #compchem
nature.com
Robust out-of-distribution prediction of Buchwald–Hartwig reactions - Nature Computational Science
A predictive model capable of generalizing to previously unseen Buchwald–Hartwig chemical space is built to enable rapid, in silico optimization, reducing reaction scouting time from weeks to minutes.
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Jan H. Jensen @janhjensen.bsky.social · 06/08/2026
That's what I started to do.
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Jan H. Jensen @janhjensen.bsky.social · 03/08/2026
you can find many other talks from that meeting here: aichemist.eu/lectures
aichemist.eu
Lectures and Seminars | AiChemist MSCA-DN
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Jan H. Jensen @janhjensen.bsky.social · 03/08/2026
My talk on explainable AI, June 2026, in Copenhagen. #compchem You can find the paper here: doi.org/10.21468/Sci... youtu.be/z1TZJXvlc5o?...
youtu.be
"Explainable AI: Understanding, Prediction and Trust", lecture by Prof. Jan Jensen
YouTube video by AiChemist-MSCA-DN
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Jan H. Jensen @janhjensen.bsky.social · 31/07/2026
New highlight: From SMILES Codes for Reactants and Products to Transition States With VeloxChem www.compchemhighlights.org/2026/07/from... #compchem
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Jan H. Jensen @janhjensen.bsky.social · 28/07/2026
Axel Dieter Becke: Not just the "B" in "B3LYP" arxiv.org/abs/2607.21465 #compchem
arxiv.org
Axel Dieter Becke: Not just the "B" in "B3LYP"
There is hardly anyone doing electronic structure calculations on molecules who has not used the famous B3LYP functional. Many will even know that the "B" in B3LYP stands for Becke, but how many know ...
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Jan H. Jensen @janhjensen.bsky.social · 23/07/2026
SmartReact: An Open-Source Python Package for Scalable Forward Synthesis Enumeration Built on Interpretable SMARTS Templates | ChemRxiv chemrxiv.org/doi/abs/10.2... #compchem
chemrxiv.org
SmartReact: An Open-Source Python Package for Scalable Forward Synthesis Enumeration Built on Interpretable SMARTS Templates | ChemRxiv
Predicting which products can be made from a set of building blocks underpins library design, analogue generation, and synthesis-constrained generative modelling. Reaction templates encoded as SMARTS patterns are the standard tool for this forward ...
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Jan H. Jensen @janhjensen.bsky.social · 23/07/2026
ROBUST TRANSFER LEARNING FOR BAYESIAN OPTIMIZATION OF CHEMICAL REACTIONS | ChemRxiv chemrxiv.org/doi/abs/10.2... #compchem
chemrxiv.org
ROBUST TRANSFER LEARNING FOR BAYESIAN OPTIMIZATION OF CHEMICAL REACTIONS | ChemRxiv
Transfer learning offers a promising route to accelerate Bayesian optimization (BO) by reusing knowledge acquired during related optimization tasks. In chemical reaction optimization, this most natura...
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Jan H. Jensen @janhjensen.bsky.social · 23/07/2026
Position: The Inevitable Transition to Machine Learning in Quantum Chemistry arxiv.org/abs/2607.18281 #compchem
arxiv.org
Position: The Inevitable Transition to Machine Learning in Quantum Chemistry
Finding exact solutions to the quantum many-body problem is computationally intractable (QMA-hard). Traditional approximations for electrons in an atom or molecule -- density functional theory and wav...
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Jan H. Jensen @janhjensen.bsky.social · 21/07/2026
A Recursive Algorithm for Finding Multi-Step Reaction Mechanisms | ChemRxiv chemrxiv.org/doi/abs/10.2... #compchem
chemrxiv.org
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Jan H. Jensen @janhjensen.bsky.social · 21/07/2026
MLIP-Enhanced Thermochemistry Predictions across Organic Chemical Space | ChemRxiv chemrxiv.org/doi/abs/10.2... #compchem
chemrxiv.org
MLIP-Enhanced Thermochemistry Predictions across Organic Chemical Space | ChemRxiv
This work presents thermoMLIP, a machine-learning-interatomic-potential-based workflow for efficient conformer optimization and thermochemistry prediction across organic chemical space. By combining M...
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Jan H. Jensen @janhjensen.bsky.social · 16/07/2026
Recording's of some of talks can be found here: aichemist.eu/lectures
aichemist.eu
Lectures and Seminars | AiChemist MSCA-DN
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Jan H. Jensen @janhjensen.bsky.social · 13/07/2026
Systematic Expansion of Chemical Reaction Space from Graph-Based Model Reactions | ChemRxiv chemrxiv.org/doi/abs/10.2... #compchem
chemrxiv.org
Systematic Expansion of Chemical Reaction Space from Graph-Based Model Reactions | ChemRxiv
Computational kinetic modeling relies on accurate transition-state geometries and activation barriers. While machine learning models trained on ab initio data have shown promise for transition-state s...
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Jan H. Jensen @janhjensen.bsky.social · 09/07/2026
Chemically Interpretable Explanations for Molecular Property Prediction via Fragment-Level Shapley Values | ChemRxiv chemrxiv.org/doi/full/10.... #compchem
chemrxiv.org
Chemically Interpretable Explanations for Molecular Property Prediction via Fragment-Level Shapley Values | ChemRxiv
Machine learning has emerged as a powerful approach for molecular property prediction and drug discovery. However, the black-box nature of many machine learning models limits their interpretability, trustworthiness, and adoption in interdisciplinary ...
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Jan H. Jensen @janhjensen.bsky.social · 09/07/2026
Solitarius: An Agentic Architecture for Computer-aided Molecular Inverse Design | ChemRxiv chemrxiv.org/doi/abs/10.2... #compchem
chemrxiv.org
Solitarius: An Agentic Architecture for Computer-aided Molecular Inverse Design | ChemRxiv
Applying generative molecular design requires both chemical knowledge to turn a scientific aim into a computable objective and technical skill to configure and run the workflow that pursues it. Here, ...
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Jan H. Jensen @janhjensen.bsky.social · 01/07/2026
For your protonation needs. Protonate your next molecule with ProtonPen™️
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Jan H. Jensen @janhjensen.bsky.social · 30/06/2026
"She was not burned out from writing code. She had barely written any in eight months. She was burned out from reading it. From being the last human standing between an agent’s confident output and our production systems." blog.stackademic.com/my-best-seni...
blog.stackademic.com
My Best Senior Engineer Quit Last Month. Her Exit Interview Was Scheduled for Forty Minutes.
She was not burned out from writing code. She had barely written any in eight months. She was burned out from reading it. From being the…
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Jan H. Jensen @janhjensen.bsky.social · 27/06/2026
New highlight: Developing Pharmaceutically Relevant Pd-Catalyzed C−N Coupling Reactivity Models Leveraging High-Throughput Experimentation www.compchemhighlights.org/2026/06/deve... #compchem
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Reposted by Jan H. Jensen
Kresten Lindorff-Larsen @lindorfflarsen.bsky.social · 23/06/2026
Come join the new Novo Nordisk Foundation Center for Protein Design as a group leader Cool science in a great scientific environment in wonderful and very family friendly Copenhagen There are two positions that can either be at TT assistant or associate prof level employment.ku.dk/tenure-track...
employment.ku.dk
Tenure-track Assistant Professor or Associate Professor of De novo Protein Design
The Novo Nordisk Foundation Center for Protein Design at the University of Copenhagen seeks to appoint two new group leaders in de novo protein design from 1 February 2027 or as soon as possible thereafter. These positions will be at the Assistant or Associate Professor level and associated with the Department of Biology (Faculty of Science) or the Department of Drug Design and Pharmacology (Faculty of Health and Medical Sciences).
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Jan H. Jensen @janhjensen.bsky.social · 22/06/2026
Whoa. How long is each exam?
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Jan H. Jensen @janhjensen.bsky.social · 21/06/2026
"Making expert work cheaper does not simply replace experts. It creates more situations where expert judgment is needed." every.to/p/after-auto...
every.to
After Automation
AI progress creates more work for humans, not less
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Jan H. Jensen @janhjensen.bsky.social · 21/06/2026
10 oral exams for me this past week. Couldn't agree more.
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AiChemist MSCA DN @aichemist.bsky.social · 18/06/2026
It's already Day 4! The penultimate day of the CPH 🇩🇰 #summerschool has kicked off with a lecture from @jonasverhellen.bsky.social, who is sharing his thoughts on #computational diversity in the age of #XAI. Follow the rest of the talks (no signup required) ---> aichemist.eu/lectures.
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Jan H. Jensen @janhjensen.bsky.social · 17/06/2026
#compchem
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Jan H. Jensen @janhjensen.bsky.social · 14/06/2026
Due to a last minute cancellation, we will start at 10:30 on Monday
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Jan H. Jensen @janhjensen.bsky.social · 05/06/2026
#compchem
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Jan H. Jensen @janhjensen.bsky.social · 04/06/2026
New highlight: Harnessing AtomisticSkills for Agentic Atomistic Research www.compchemhighlights.org/2026/05/harn... #compchem
compchemhighlights.org
Harnessing AtomisticSkills for Agentic Atomistic Research
Bowen Deng, Bohan Li, Matthew Cox, Hoje Chun, Juno Nam, Artur Lyssenko, Sathya Edamadaka, Jurgis Ruza, Xiaochen Du, Nofit Segal, Jesus Diaz ...
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Reposted by Jan H. Jensen
AiChemist MSCA DN @aichemist.bsky.social · 02/06/2026
📢 Join us online at the AiChemist CPH Summer School (15–19 June 2026)! Explore #ExplainableAI in #Chemistry & #Toxicology with top speakers from academia, industry & regulators. 🔗 Full (hybrid) Programme: aichemist.eu/lectures #XAI #MachineLearning #Cheminformatics #AI4Science
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Jan H. Jensen @janhjensen.bsky.social · 01/06/2026
New preprint: Practical computational exploration of chemical reaction space: Assessing the chemical stability of active pharmaceutical ingredients under acidic conditions doi.org/10.26434/che... #compchem
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Jan H. Jensen @janhjensen.bsky.social · 30/05/2026
I stopped reading it after "Sure! Here's a Papal Encyclical on AI ..."
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Jan H. Jensen @janhjensen.bsky.social · 29/05/2026
Try for yourself at regioselect.org
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Jan H. Jensen @janhjensen.bsky.social · 29/05/2026
cc @hartwiggroup.bsky.social
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Jan H. Jensen @janhjensen.bsky.social · 29/05/2026
New preprint: Chemically Intuitive Descriptors for Predicting C–H Borylation Regioselectivity doi.org/10.26434/che... #compchem with Rasmus Borup & @valencekjell.com
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Jan H. Jensen @janhjensen.bsky.social · 21/05/2026
New preprint: Computational Prediction of Substrate Scope of a Homogeneous Catalyst: The Case of Metal-free C-H Borylation by a Frustrated Lewis Pair Catalyst doi.org/10.26434/che... #compchem
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Jan H. Jensen @janhjensen.bsky.social · 21/05/2026
A unified framework for automated transition state generation to accelerate mechanistic exploration in organic synthesis | ChemRxiv #compchem chemrxiv.org/doi/full/10....
chemrxiv.org
A unified framework for automated transition state generation to accelerate mechanistic exploration in organic synthesis | ChemRxiv
Accurate generation of intricate 3D molecular structures is a fundamental challenge in computational chemistry. Transition states (TS), the transient structures that dictate reaction kinetics, exempli...
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Jan H. Jensen @janhjensen.bsky.social · 19/05/2026
Benchmark of double-ended transition state search methods for metal-catalysed reactions | ChemRxiv chemrxiv.org/doi/full/10.... #compchem
chemrxiv.org
Benchmark of double-ended transition state search methods for metal-catalysed reactions | ChemRxiv
Efficient and reliable identification of transition states (TS) is critical for reaction modelling. Among the available approaches, the combination of double-ended TS search with eigenvector-following...
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