About: http://webisa.webdatacommons.org/187733175

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	where R1 is ???H or ???NH2 and R2 is ???H, ???NH2, a hydrocarbon group, an amino group, a carbonyl group, an imido group, an azo group, a cyano group, a thio group, or a seleno group and ???OR7 where R7 is a hydrocarbon group.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es