The 1,3-Cyclobutanedione, its CAS registry number is 15506-53-3. This chemical's molecular formula is C₄H₄O₂ and molecular weight is 84.07. What's more, its IUPAC name is Cyclobutane-1,3-dione.

Physical properties of 1,3-Cyclobutanedione are: (1)ACD/LogP: -1.64; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): -1.64; (4)ACD/LogD (pH 7.4): -1.81; (5)ACD/BCF (pH 5.5): 1; (6)ACD/BCF (pH 7.4): 1; (7)ACD/KOC (pH 5.5): 3.05; (8)ACD/KOC (pH 7.4): 2.03; (9)#H bond acceptors: 2; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 0; (12)Polar Surface Area: 34.14 Å²; (13)Index of Refraction: 1.496; (14)Molar Refractivity: 18.7 cm³; (15)Molar Volume: 63.9 cm³; (16)Polarizability: 7.41×10^-24 cm³; (17)Surface Tension: 50.9 dyne/cm; (18)Density: 1.314 g/cm³; (19)Flash Point: 82.2 °C; (20)Enthalpy of Vaporization: 46.34 kJ/mol; (21)Boiling Point: 226.9 °C at 760 mmHg; (22)Vapour Pressure: 0.08 mmHg at 25 °C.

You can still convert the following datas into molecular structure:
(1)Canonical SMILES: C1C(=O)CC1=O
(2)InChI: InChI=1S/C4H4O2/c5-3-1-4(6)2-3/h1-2H2
(3)InChIKey: PZQGSZRQKQZCOJ-UHFFFAOYSA-N