Representation of CXSMILES

CXSMILES is an extension of SMILES with more powerful regular expression-like matching: https://docs.chemaxon.com/latest/formats_chemaxon-extended-smiles-and-smarts-cxsmiles-and-cxsmarts.html#atom-properties It already has a Wikidata property and is annotated on many molecules: https://www.wikidata.org/wiki/Property:P10718 Here's an example CXSMILES string for [1-phosphatidyl-1D-myo-inositol 3-phosphate (R1,R2)](https://www.wikidata.org/wiki/Q46220488): ``` [H][C@@](COC([*])=O)(COP(O)(=O)O[C@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](OP(O)(O)=O)[C@H]1O)OC([*])=O |$;;;;;_R1;;;;;;;;;;;;;;;;;;;;;;;;;_R2$| ``` It would be nice for there to be a chemrof entry for this