About: http://webisa.webdatacommons.org/68712536

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	the symbols R1 and R9 are identical or different and represent a hydrogen atom or an alkyl radical containing from 1 to 8 carbon atoms, preferably 1 or 2 carbon atoms and most particularly 1 carbon atom,
http://www.w3.org/ns/prov#wasQuotedFrom	google.com