About: http://webisa.webdatacommons.org/121692777

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	Preferably, R3 is a methyl group, R4 is either hydrogen or a methyl group, and R5 and R6 are methyl, ethyl, hexyl, cyclopentyl, cyclohexyl, pyrrolidine, piperidine, piperazine and morpholine.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com