Material Compound	Medical Subject Headings	Source
http://sweet.jpl.nasa.gov/2.3/matrCompound.owl#Perchlorate	http://purl.bioontology.org/ontology/MESH/C494474	LOOM
http://sweet.jpl.nasa.gov/2.3/matr.owl#Chemical	http://purl.bioontology.org/ontology/STY/T103	LOOM