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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	O)R, S(O)R, SO2R, SO3R, P(O)R, PO2R, or PO3R, where R is a hydrogen, alkyl, aryl or heteroaryl group. 73.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com