heteropolycyclic compound
http://purl.obolibrary.org/obo/CHEBI_33671
http://purl.obolibrary.org/obo/chebi.owl
CHEBI:33671
http://purl.obolibrary.org/obo/CHEBI_33635
http://purl.obolibrary.org/obo/CHEBI_5686