Yellow No.403-(1)
　 　　 　

Legal color:	Yellow No.403-1
General name:	Naphthol Yellow S
Class:	Acid Dye
FDA :	EXT.D & C Yellow No.7
CI #:	C.I. 10316
Color #:	Acid Yellow 1
CAS #:	846-70-8
CAS :	2-Naphthalenesulfonic acid,8-hydroxy-5,7-dinitro-,disodium salt
IUPAC:	→1;Disodium 5,7-dinitro-8-oxido-2-naphthalenesulfonate →2;Disodium 2,4-dinitro-7-sulfonato-1-naphthoate →3;5,7-Dinitro-8-hydroxy-2-naphthalenesulfonic acid disodium salt
Chemical structure :	Naphthol Yellow S