The 7H-[1]Benzopyrano[3',2':3,4]pyrido[1,2-a]benzimidazole-6-carbonitrile,3-(diethylamino)-7-imino- is an organic compound with the molecular formula C₂₃H₁₉N₅O. The systematic name of this chemical is 3-(diethylamino)-7-imino-7H-chromeno[3',2':3,4]pyrido[1,2-a]benzimidazole-6-carbonitrile. With the CAS registry number 52372-39-1, it is also named as Solvent Red 197. The product's categories is solvent dyestuff. In addition, it is bright red powder which is insoluble in water.

The other characteristics of this product can be summarized as: (1)ACD/LogP: 8.40; (2)# of Rule of 5 Violations: 1; (3)ACD/LogD (pH 5.5): 5; (4)ACD/LogD (pH 7.4): 5; (5)ACD/BCF (pH 5.5): 4102; (6)ACD/BCF (pH 7.4): 7226; (7)ACD/KOC (pH 5.5): 11393; (8)ACD/KOC (pH 7.4): 20072; (9)#H bond acceptors: 6; (10)#H bond donors: 1; (11)#Freely Rotating Bonds: 3; (12)Index of Refraction: 1.713; (13)Molar Refractivity: 111.614 cm³; (14)Molar Volume: 284.671 cm³; (15)Polarizability: 44.247×10^-24 cm³; (16)Surface Tension: 54.897 dyne/cm; (17)Enthalpy of Vaporization: 83.977 kJ/mol; (18)Vapour Pressure: 0 mmHg at 25°C; (19)Rotatable Bond Count: 3; (20)Exact Mass: 381.15896; (21)MonoIsotopic Mass: 381.15896; (22)Topological Polar Surface Area: 77.9; (23)Heavy Atom Count: 29; (24)Complexity: 803.

Preparation of 7H-[1]Benzopyrano[3',2':3,4]pyrido[1,2-a]benzimidazole-6-carbonitrile,3-(diethylamino)-7-imino-: It can be obtained by 4-diethylamino salicylaldehyde, 2-cyanomethyl benzimidazole and malononitrile. First, condensating 4-diethylamino salicylaldehyde and 2-cyanomethyl benzimidazole in DMF and then with malononitrile condensation, then closed loop to get the product.

Uses of this chemical: It is mainly used for coloring polystyrene, polyvinyl chloride, polycarbonate and other plastics. And it is particularly suitable for light-colored and transparent colors. In addition, it can be used for staining variety of resin and fiber.

People can use the following data to convert to the molecule structure. 
1. SMILES: CCN(CC)c3ccc4/C=C5/c2nc1ccccc1n2C(=N)C(\C#N)=C5\Oc4c3;
2. InChI: InChI=1/C23H19N5O/c1-3-27(4-2)15-10-9-14-11-16-21(29-20(14)12-15)17(13-24)22(25)28-19-8-6-5-7-18(19)26-23(16)28/h5-12,25H,3-4H2,1-2H3.