The Pigment Yellow 188, its cas register number is 23792-68-9. It also can be called as 2-[[3,3'-Dichloro-4'-[[1-(phenylcarbamoyl)acetonyl]azo]-4-biphenylyl]azo]-2',4'-acetoacetoxylidide and the Systematic name about this chemical is 2-[2-Chloro-4-[3-chloro-4-[1-[(2,4-dimethylphenyl)carbamoyl]-2-oxo-propyl]azo-phenyl]phenyl]azo-3-oxo-N-phenyl-butanamide.

Physical properties about Pigment Yellow 188 are: (1)#H bond acceptors: 10; (2)#H bond donors: 2; (3)#Freely Rotating Bonds: 11; (4)Polar Surface Area: 141.78Ų; (5)Index of Refraction: 1.64; (6)Molar Refractivity: 179.24 cm³; (7)Molar Volume: 497.1 cm³; (8)Polarizability: 71.05x10^-24cm³; (9)Surface Tension: 49.2 dyne/cm; (10)Enthalpy of Vaporization: 116.5 kJ/mol; (11)Vapour Pressure: 1.08E-25 mmHg at 25°C

You can still convert the following datas into molecular structure:
(1)SMILES: Cc1ccc(c(c1)C)NC(=O)C(C(=O)C)N=Nc2ccc(cc2Cl)c3ccc(c(c3)Cl)N=NC(C(=O)C)C(=O)Nc4ccccc4
(2)InChI: InChI=1/C34H30Cl2N6O4/c1-19-10-13-28(20(2)16-19)38-34(46)32(22(4)44)42-40-30-15-12-24(18-27(30)36)23-11-14-29(26(35)17-23)39-41-31(21(3)43)33(45)37-25-8-6-5-7-9-25/h5-18,31-32H,1-4H3,(H,37,45)(H,38,46)
(3)InChIKey: MKRODNLHLSBLDO-UHFFFAOYAM
(4)Std. InChI: InChI=1S/C34H30Cl2N6O4/c1-19-10-13-28(20(2)16-19)38-34(46)32(22(4)44)42-40-30-15-12-24(18-27(30)36)23-11-14-29(26(35)17-23)39-41-31(21(3)43)33(45)37-25-8-6-5-7-9-25/h5-18,31-32H,1-4H3,(H,37,45)(H,38,46)
(5)Std. InChIKey: MKRODNLHLSBLDO-UHFFFAOYSA-N