About: http://webisa.webdatacommons.org/33490156

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	R13 is preferably H, C1 -C4 alkyl, more particularly methyl, or NH2, NHCH3 or (CH3)2 N.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com