OPSIN - Open Parser for Systematic IUPAC Nomenclature, has been updated https://github.com/dan2097/opsin/releases/tag/2.7.0.

OPSIN is a Java library for IUPAC name-to-structure conversion offering high recall and precision on organic chemical nomenclature.

Java 8 (or higher) is required for OPSIN 2.7.0

Supported outputs are SMILES, CML (Chemical Markup Language) and InChI (IUPAC International Chemical Identifier)

Convert a chemical name to SMILES

java -jar opsin-cli-2.7.0-jar-with-dependencies.jar -osmi input.txt output.txt

where input.txt contains chemical name/s, one per line