Fast Yellow AB
Identifiers
CAS number	[2706-28-7]
SMILES	Nc1ccc(cc1S(O)(=O)=O)/N=N/c2ccc(cc2)S(O)(=O)=O
Properties
Molecular formula	C12H11N3O6S2
Molar mass	357.36
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Fast Yellow AB, Fast Yellow, Acid Yellow, C.I. 13015, C.I. 14270 or Food Yellow 2 is an azo dye denoted by E number E105. It is used as a food dye. 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. Image File history File links Size of this preview: 800 × 367 pixelsFull resolution (1415 × 649 pixel, file size: 9 KB, MIME type: image/png) Description: Chemical structure of Fast Yellow AB Author, date of creation: selfmade by Shaddack, 5 November 2005 Source: self-made Copyright: Public Domain (PD) Comments: b... CAS registry numbers are unique numerical identifiers for chemical compounds, polymers, biological sequences, mixtures and alloys. ... The simplified molecular input line entry specification or SMILES is a specification for unambiguously describing the structure of chemical molecules using short ASCII strings. ... This article does not cite its references or sources. ... Molar mass is the mass of one mole of a chemical element or chemical compound. ... In chemistry, the standard state of a material is its state at 1 bar (100 kilopascals) and 25 degrees Celsius (298. ... In chemistry, azo compounds generally have a molecular formula of the form R-N=N-R, in which R and R can be either aromatic or aliphatic. ... For the mathematical constant see: E (mathematical constant). ... The color of food is considered important in its enjoyment. ...