About: http://webisa.webdatacommons.org/397672105

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Although most organic compounds are composed of C, H, N, O, P, or S atoms, other elements including F, Cl, Br, and Si must be considered for compounds of unknown origin.
http://www.w3.org/ns/prov#wasQuotedFrom	epa.gov