Enzyme Reaction Ontology for annotating Partial Information of chemical transformation	The Drug-Drug Interactions Ontology	Source
http://purl.obolibrary.org/obo/dinto_000025	http://reactionontology.org/piero/object	LOOM
http://purl.obolibrary.org/obo/dinto_000130	http://www.kegg.jp/entry/enzyme	LOOM