Acid Yellow 23

The IUPAC name of Acid Yellow 23 is trisodium 5-oxo-1-(4-sulfonatophenyl)-4-[(4-sulfonatophenyl)diazenyl]-4H-pyrazole-3-carboxylate. With the CAS registry number 1934-21-0, it is also named as 1H-Pyrazole-3-carboxylic acid, 4,5-dihydro-5-oxo-1-(4-sulfophenyl)-4-((4-sulfophenyl)azo)-, trisodium salt; Tartrazine. The product's categories are dyes and pigments; organics; analytical chemistry; food colors by food sanitation law in Japan. It is deep yellow powder which is soluble in water, glycerin and propylene glycol, slightly soluble in ethanol. In addition, this chemical is stable, hygroscopic and incompatible with strong oxidizing agents. it must be stored in a cool, dry place and keep container closed when not in use. Furthermore, Acid Yellow 23 is used as colorant for food, beverage, medicine, feed and cosmetic.

The other characteristics of this product can be summarized as: (1)#H bond acceptors: 13; (2)#H bond donors: 4; (3)#Freely Rotating Bonds: 6; (4)Rotatable Bond Count: 3; (5)Tautomer Count: 4; (6)Exact Mass: 533.950403; (7)MonoIsotopic Mass: 533.950403; (8)Topological Polar Surface Area: 229; (9)Heavy Atom Count: 34; (10)Complexity: 949; (11)Undefined Atom StereoCenter Count: 1; (12)Covalently-Bonded Unit Count: 4.

Preparation of Acid Yellow 23: It can be obtained by the condensation of two-hydroxy-tartaric acid and phenylhydrazine-p-sulfonic acid. Or coupling 1-(4'-sulfophenyl)-3-carboxy-5-pyrazolidone and sulfanilic acid which is diazotization, then salting with sodium chloride. Finally, we can get the product by purification.

When you are using this chemical, please be cautious about it as the following:
It may cause sensitization by inhalation and skin contact, so people should not breathe dust and avoid contact with skin and eyes. If you want to contact this product, you must wear suitable protective clothing and gloves. In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 

People can use the following data to convert to the molecule structure. 
1. SMILES: c1cc(ccc1N=Nc2c([nH]n(c2=O)c3ccc(cc3)S(=O)(=O)[O-])C(=O)[O-])S(=O)(=O)[O-].[Na+].[Na+].[Na+];
2. InChI: InChI=1/C16H12N4O9S2.3Na/c21-15-13(18-17-9-1-5-11(6-2-9)30(24,25)26)14(16(22)23)19-20(15)10-3-7-12(8-4-10)31(27,28)29;;;/h1-8,19H,(H,22,23)(H,24,25,26)(H,27,28,29);;;/q;3*+1/p-3/b18-17+;;;.

The following are the toxicity data which has been tested.