About: http://webisa.webdatacommons.org/212051279

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	When one of the R groups is a hydrogen atom, the ink containing the material is generally maintained at a pH at which the compound is in its protonated form so that the nitrogen atom is cationic.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com