The 3,6-Dichloro-4-(4-pyridinyl)pyridazine with the cas number 202931-70-2, is also called 3,6-dichloro-4-(pyridin-4-yl)pyridazine .The properties of the 3,6-Dichloro-4-(4-pyridinyl)pyridazine are: (1)#H bond acceptors:  3  ; (2)#H bond donors:  0  ; (3)#Freely Rotating Bonds:  1  ; (4)Polar Surface Area:  38.67 Å²  ; (5)Index of Refraction:  1.61  ; (6)Molar Refractivity:  54.9 cm³  ; (7)Molar Volume:  158.2 cm³  ; (8)Polarizability:  21.76×10^-24cm³  ; (9)Surface Tension:  56.9 dyne/cm; (10)Enthalpy of Vaporization:  62.28 kJ/mol   ; (11)Vapour Pressure:  3.6×10^-6 mmHg at 25°C.

You can still convert the following datas into molecular structure :
1.Clc2cc(c1ccncc1)c(Cl)nn2
2.InChI=1/C9H5Cl2N3/c10-8-5-7(9(11)14-13-8)6-1-3-12-4-2-6/h1-5H