About: http://webisa.webdatacommons.org/382867419

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	with the proviso that at least one of R2 and R4 must be hydrogen and the alkyl moieties, except as otherwise noted, in each instance include from 1 to 6 carbon atoms and the cycloalkyl moieties have from 3 to 10 carbon atoms.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com