pymatgen
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Support `Molecule.from_str(SMILES)` without `openbabel`
openbabel is difficult to install, esp. on Mac and apparently has been since 2012.
Current 1st party support in Molecule.from_str() is limited to xyz, gjf, g03, json.
SMILES is very widely used and warrants 1st party support.
Just use https://github.com/pckroon/pysmiles ?