The 4-Phenyl-1,2,4-triazoline-3,5-dione, with the CAS registry number 4233-33-4 and EINECS registry number 224-191-7, has the systematic name of 4-phenyl-3H-1,2,4-triazole-3,5(4H)-dione. And the molecular formula of the chemical is C₈H₅N₃O₂. What's more, while dealing with this chemical, you should be cautious: Do not breathe dust and avoid contact with skin and eyes.

The characteristics of this chemical are as followings: (1)ACD/LogP: 0.82; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 0.821; (4)ACD/LogD (pH 7.4): 0.821; (5)ACD/BCF (pH 5.5): 2.475; (6)ACD/BCF (pH 7.4): 2.475; (7)ACD/KOC (pH 5.5): 66.585; (8)ACD/KOC (pH 7.4): 66.585; (9)#H bond acceptors: 5; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 1; (12)Polar Surface Area: 62.1 Å²; (13)Index of Refraction: 1.701; (14)Molar Refractivity: 46.081 cm³; (15)Molar Volume: 119.083 cm³; (16)Polarizability: 18.268×10^-24cm³; (17)Surface Tension: 65.373 dyne/cm; (18)Density: 1.471 g/cm³; (19)Flash Point: 113.35 °C; (20)Enthalpy of Vaporization: 50.166 kJ/mol; (21)Boiling Point: 263.812 °C at 760 mmHg; (22)Vapour Pressure: 0.01 mmHg at 25°C. 

Uses of 4-Phenyl-1,2,4-triazoline-3,5-dione: It can react with 2-vinyl-thiophene to produce 2-phenyl-5,9a-dihydro-thieno[3,2-c][1,2,4]triazolo[1,2-a]pyridazine-1,3-dione. This reaction will need reagent dioxane. The reaction time is 0.5 hours with ambient temperature, and the yield is about 94%.    

Addtionally, the following datas could be converted into the molecular structure:
(1)SMILES: c1ccc(cc1)N2C(=O)N=NC2=O
(2)InChI: InChI=1/C8H5N3O2/c12-7-9-10-8(13)11(7)6-4-2-1-3-5-6/h1-5H
(3)InChIKey: ISULLEUFOQSBGY-UHFFFAOYAD