Assertion: pigment violet | /r/HasProperty | an azo compound
Facets:
value: with the chemical formula
type: OTHER
Source sentences:
text: Azo violet (4-(4-nitrophenylazo)resorcinol) (or p-nitrobenzeneazoresorcinol) is an azo compound with the chemical formula C 12 H 9 N 3 O 4 .