Yellow No.4

Legal color:	Yellow No.4
General name:	Tartrazine
Class:	Acid Dye
FDA :	FD & C Yellow No.5
CI #:	C.I. 19140
Color #:	Acid Yellow 23
CAS #:	1934-21-0
CAS :	：1H-Pyrazole-3-carboxylic acid,4,5-dihydro-5-oxo-1-(4-sulfophenyl)-4-[(4-sulfophenyl)azo]-,trisodium salt
IUPAC:	→1;Trisodium 1-(4-sulfonatophenyl)-4-(4-sulfonatophenylazo)-5-pyrazolone-3- carboxylate →2;p-[1-(3-carboxy-5-oxo-4'-sulfophenyl-2-pyrazolin-4-ylazo]benzenesulfonic acid trisodium salt →3;4-[1-(3-carboxy-5-oxo-4'-sulfophenyl-2-pyrazolin-4-ylazo]benzene
Chemical structure :	Tartrazine