The Acid Yellow 61 belongs to the product categories of dyes and pigments; organics. With the cas register number 12217-38-8, it has other names as Benzenesulfonic acid,2,5-dichloro-4-[4-[2-[2-[(ethylphenylamino)sulfonyl]phenyl]diazenyl]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]-,sodium salt (1:1). This is a kind of yellow powder and soluble in water.

The characteristics of this chemical are as below: (1)H-Bond Donor: 1; (2)H-Bond Acceptor: 10; (3)Rotatable Bond Count: 9; (4)Tautomer Count: 4; (5)Exact Mass: 631.012975; (6)MonoIsotopic Mass: 631.012975; (7)Topological Polar Surface Area: 178; (8)Heavy Atom Count: 40; (9)Complexity: 1160; (10)Undefined Atom StereoCenter Count: 1; (11)Covalently-Bonded Unit Count: 2.

The production method is as the following: First prepar the material of 2-amino-N-ethylphenylsulfonylaniline and 1- (2',5'-dichlorine-4'-sulfonateylphenyl) -3-methyl-5-pyrazoleolinone, and then diazotize the former; Secondly, couple with the latter to get the crude; Finally, you could get the products after filter, dry and smash to get the products.

As to its usage, it is widely applied in many ways. It could be used in dyeing and printing of wool, silk, nylon and blend fabric, and also in the direct printing of wool and other fabric. It could also be  used in leather coloration.

The following datas could be converted into the molecular structure:
(1)Canonical SMILES: CC1=NN(C(=O)C1N=NC2=CC(=CC=C2)S(=O)(=O)NCCC3=CC=CC=C3)C4=CC(=C(C=C4Cl)S
   (=O)(=O)[O-])Cl.[Na+]
(2)InChI: InChI=1S/C24H21Cl2N5O6S2.Na/c1-15-23(24(32)31(30-15)21-13-20(26)22(14-19
   (21)25)39(35,36)37)29-28-17-8-5-9-18(12-17)38(33,34)27-11-10-16-6-3-2-4-7-16;/h2-9,12-14,23,27H,10   -11H2,1H3,(H,35,36,37);/q;+1/p-1 
(3)InChIKey: MOBJCMJALNXKIW-UHFFFAOYSA-M