About: http://webisa.webdatacommons.org/218925403

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	h of R21 and R22, independently of the other, is an alkyl group, wherein one of R21 and R22 can also be a hydrogen atom.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com