Optional_OptionalattachmentAn attached file with the structural representation
OptionalextensionAdditional content defined by implementations
OptionalidUnique id for inter-element referencing
OptionalmodifierExtensions that cannot be ignored even if unrecognized
OptionalrepresentationThe structural representation as text string in a format e.g. InChI, SMILES, MOLFILE, CDX
OptionaltypeThe type of structure (e.g. Full, Partial, Representative)
The structural representation as text string in a format e.g. InChI, SMILES, MOLFILE, CDX