About: http://webisa.webdatacommons.org/175638804

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	provided that when R1 is H, R2 and R3 are not both unsubstituted phenyl; and when R1 is H, R2 and R3 are other than H, halogen, or an unsubstituted alkyl.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com