About: http://webisa.webdatacommons.org/132925014

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	one to two carbon atoms or hydroxymethyl and n is an integer of 0 to 4; and R4 and R5 are each hydrogen, alkyl of one to six carbon atoms, cycloalkylmethyl of six to eight carbon atoms or benzyl.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com