Aromatic Ring is not supported
If SMILES for compound is presented by explicit aromatic bonds ':' but the query SMILES input is composed by '-' and '=' then query failed. C1=CC=CC=C1 is not recognized as aromatic.
Faied cases
CC=1C(=O)C=CC(C1)=O, Ring not broken at single bond
P(c1ccccc1)(c1ccccc1)c1ccccc1, Ring indexes duplicated in each branch
Other issues in list