A canonical form of the SMILES linear text format
The SMILES format is a linear text format which can describe the connectivity and chirality of a molecule. Canonical SMILES gives a single ‘canonical’ form for any particular molecule.
| a | Output atomclass like [C:2], if available |
| h | Output explicit hydrogens as such |
| i | Do not include isotopic or chiral markings |
| n | No molecule name |
| r | Radicals lower case eg ethyl is Cc |
| t | Molecule name only |
See also, the “regular” SMILES format, which results in faster output, since no canonical numbering is performed.