The Pyridazine-4,5-dicarboxylic acid, with the CAS registry number 59648-14-5, is also known as 4,5-Pyridazinedicarboxylic acid. This chemical's molecular formula is C₆H₄N₂O₄ and formula weight is 168.11. What's more, its systematic name is called pyridazine-4,5-dicarboxylic acid. When you are using this chemical, please be cautious about it. It may cause inflammation to the skin or other mucous membranes. 

Physical properties of Pyridazine-4,5-dicarboxylic acid: (1)ACD/LogP: -2.18 ; (2)ACD/BCF (pH 5.5): 1; (3)ACD/BCF (pH 7.4): 1; (4)ACD/KOC (pH 5.5): 1; (5)ACD/KOC (pH 7.4): 1; (6)#H bond acceptors: 6; (7)#H bond donors: 2; (8)#Freely Rotating Bonds: 2; (9)Index of Refraction: 1.638; (10)Molar Refractivity: 36.29 cm³; (11)Molar Volume: 100.9 cm³; (12)Surface Tension: 100.7 dyne/cm; (13)Density: 1.665 g/cm³; (14)Melting Point: >210(dec.); (15)Flash Point: 280 °C; (16)Enthalpy of Vaporization: 85.97 kJ/mol; (17)Boiling Point: 539.4 °C at 760 mmHg; (18)Vapour Pressure: 1.81E-12 mmHg at 25°C.

You can still convert the following datas into molecular structure:
(1)SMILES: O=C(O)c1c(C(=O)O)cnnc1
(2)InChI: InChI=1/C6H4N2O4/c9-5(10)3-1-7-8-2-4(3)6(11)12/h1-2H,(H,9,10)(H,11,12)
(3)InChIKey: YRTBTTMXMPXJBB-UHFFFAOYAA