ChEBI additional fields

[stuppie]

CAS is missing from SDF file but is present (along with many other xrefs) in the obo/owl files: ftp://ftp.ebi.ac.uk/pub/databases/chebi/ontology/chebi.obo.gz

[Term]
id: CHEBI:15578
name: (25S)-5beta-spirostan-3beta-ol
alt_id: CHEBI:178
alt_id: CHEBI:10854
alt_id: CHEBI:18537
subset: 3_STAR
synonym: "(3beta,5beta,25S)-spirostan-3-ol" RELATED [ChemIDplus]
...
xref: KNApSAcK:C00003590 
xref: Beilstein:91757 "Beilstein"
xref: KEGG:C03963 
xref: CAS:126-19-2 "KEGG COMPOUND"
xref: CAS:126-19-2 "ChemIDplus"
is_a: CHEBI:26606