Mass Spectrometry Ontology	Natural Products Ontology	Source
http://purl.obolibrary.org/obo/MS_1003039	http://purl.bioontology.org/ontology/CHEBI#amino_acid	LOOM
http://purl.obolibrary.org/obo/MS_1000882	http://www.owl-ontologies.com/NPOntology.owl#Protein	LOOM
http://purl.obolibrary.org/obo/MS_1000860	http://purl.bioontology.org/ontology/CHEBI#peptide	LOOM
http://purl.obolibrary.org/obo/MS_1003042	http://www.owl-ontologies.com/NPOntology.owl#Polysaccharide	LOOM