Fast Yellow AB

Fast Yellow AB

Skeletal formula of Fast Yellow AB
Ball-and-stick model of the Fast Yellow AB molecule
Names
IUPAC name 2-amino-5-[(E)-(4-sulfophenyl)diazenyl]benzenesulfonic acid
Other names Fast Yellow Acid Yellow Food Yellow 2 C.I. 13015
Identifiers
CAS Number	101-50-8 checkY
3D model (JSmol)	Interactive image
ChEBI	CHEBI:86124
ChEMBL	ChEMBL2172377
ChemSpider	54957
ECHA InfoCard
EC Number	202-947-7
E number
PubChem CID	60996 75918 Na salt
UNII	2ZQE5CCH2H checkY
CompTox Dashboard (EPA)	{{#property:P3117}}
InChI InChI=1S/C12H11N3O6S2/c13-11-6-3-9(7-12(11)23(19,20)21)15-14-8-1-4-10(5-2-8)22(16,17)18/h1-7H,13H2,(H,16,17,18)(H,19,20,21) Key: DCYBHNIOTZBCFS-UHFFFAOYSA-N
SMILES Nc1ccc(cc1OS(O)=O)/N=N/c2ccc(OS(O)=O)cc2
Properties
Chemical formula	C12H11N3O6S2
Molar mass	357.36 g·mol−1
Hazards
GHS labelling:
Pictograms	GHS07: Exclamation mark
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). checkY verify (what is checkY☒N ?) Infobox references

Fast Yellow AB is an azo dye. It used to be used as a food dye, designated in Europe by the E number E105. It is now delisted in both Europe and USA and is forbidden if used in foods and drinks, as toxicological data has shown it is harmful. E105 has been implicated in non-atopic asthma.