About: http://webisa.webdatacommons.org/345813254

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	It is preferred that at least one, particularly at least two substituents among the substituents R2A to R2E indicate a hydrogen atom and other substituents indicate a substituent other than hydrogen atom.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com