About: http://webisa.webdatacommons.org/8815085

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	methyl, R2 a hydrogen, an alkyl with 1 to 4 carbon atoms, or the radical --CH2 --CHR1 --COOH, and X is a direct bond or the group ##EQU8## where preferably a maximum of three carboxyl groups are present.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es