inchi key MI:0970 PSI-MI InChIKeys consist of 14 characters resulting from a hash of the connectivity information of the InChI, followed by a hyphen, followed by 9 characters resulting from a hash of the remaining layers of the InChI, followed by a single character indication the version of InChI used, another hyphen, followed by single checksum character 2009-10-28T01:13:25Z orchard inchi key checksum structure representation attribute name