Question 1

How to use OPSIN for batch conversion of chemical names to SMILES?

Accepted Answer

Use the command-line tool with the -osmi flag: 'java -jar opsin-cli.jar -osmi input.txt output.txt'. For programmatic batch processing, loop through names with NameToStructure.getInstance().parseToSmiles() in Java.

Question 2

OPSIN vs ChemAxon Name to Structure: which is better?

Accepted Answer

OPSIN is free and open-source, ideal for academic or cost-sensitive projects with strong IUPAC support, while ChemAxon is a commercial suite with broader coverage and support but requires licensing. Choose based on budget and specific nomenclature needs.

Question 3

Can OPSIN parse common drug names like acetaminophen?

Accepted Answer

OPSIN focuses on systematic IUPAC names; for common names, it may fail unless the systematic equivalent is provided. It supports some CAS names but not all trivial terms, so preprocessing might be needed.

Question 4

What are the performance implications of enabling detailed failure analysis in OPSIN?

Accepted Answer

Enabling detailedFailureAnalysis increases memory usage slightly, as noted in the README, due to right-to-left parsing. It's best for debugging but may affect efficiency in large-scale batch jobs.

Question 5

How do I handle stereochemistry warnings in OPSIN output?

Accepted Answer

Use the allowUninterpretableStereo option to ignore unparsed stereochemistry, but check the OpsinResult status for WARNINGS. Convenience methods like nameAppearsToBeAmbiguous() help diagnose issues.

Question 6

Is OPSIN suitable for converting inorganic chemical names?

Accepted Answer

No, OPSIN is primarily designed for organic nomenclature; inorganic or organometallic names are not supported, as indicated by its focus on IUPAC organic rules in the feature list.

OPSIN

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