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Publications & Presentations

The Latest Features of StarDrop 6.6

Thursday, 14 November 2019 09:50
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Matt Segall

Held on 13 November 2019.

In this webinar, presented by Matt Segall, we introduce the exciting new features in StarDrop 6.6, including: A new pKa model, included in the ADME QSAR module, combines quantum mechanics and machine learning to accurately predict acid dissociation constants for your compounds. An extended suite of SeeSAR modules that enhance StarDrop’s capabilities in structure-based design.

To hear the narration, please increase your speaker volume.

Predicting pKa Using a Combination of Quantum Mechanical and Machine Learning Methods

Monday, 18 November 2019 13:23
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Peter Hunt

Preprint Paper.

Peter Hunt1, Layla Hosseini-Gerami2, Tomas Chrien1, Jeffrey Plante3, David J. Ponting3, Matthew Segall1

1Optibrium Ltd. 2Department of Chemistry, Cambridge. 3Lhasa Ltd


The acid dissociation constant (pKa) has an important influence on molecular properties crucial to compound development in synthesis, formulation and optimisation of absorption, distribution, metabolism and excretion properties. We will present a method that combines quantum mechanical calculations, at a semi-empirical level of theory, with machine learning to accurately predict pKa for a diverse range of mono- and polyprotic compounds. The resulting model has been tested on two external data sets, one specifically used to test pKa prediction methods (SAMPL6) and the second covering known drugs containing basic functionalities. Both sets were predicted with excellent accuracy (root-mean-square errors of 0.7 – 1.0 log units), comparable to other methodologies using much higher level of theory and computational cost.

You can download the paper as a PDF

Latest Forums

Re:Trend line in Scatter Plot

Thursday, 20 February 2020 12:40

I'll answer myself: Visualization --> Customize Chart --> Lines

Category: General - How Do I...?
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Trend line in Scatter Plot

Wednesday, 19 February 2020 17:00

Hi, the Subject says it all: how can I add a trend line/linear regression to a 2D scatter plot? Probably easy, but well hidden, I cannot find it. Thanks!

Category: General - How Do I...?
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Re:number of data points managed by stardrop

Wednesday, 22 January 2020 06:38

Dear Joel, Thanks for your question and apologies for not getting back to you earlier. Unfortunately we missed your post in our online forum during the busy lead up to the holidays. You are very welcome to contact us directly at stardrop-support@optibrium.com. There is no absolute limitation to the number of molecule entries you can import in StarDrop, but it will depend on the memory available on...

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MMV Antimalarial Scoring Profile

Monday, 02 March 2020 13:48

This scoring profile was developed in collaboration with James Duffy of Medicines for Malaria Ventures (MMV) and represents their criteria for prioritisation of screening actives. It uses ten properties, including experimentally measured activities against the asexual blood stage, liver stage and sexual stages of the plasmodium parasite life cycle, selectivity over cytotoxicity in a mammalian cell line, alerts for undesirable substructures and various 'drug like' properties.

MMV Screening Actives Profile


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