The 1(2H)-Phthalazinone,4-methyl-, with the CAS registry number 5004-48-8, has the systematic name of 4-methylphthalazin-1(2H)-one. It is a kind of colourless cyrstalline solid, and belongs to the product category of Miscellaneous Reagents. And the molecular formula of the chemical is C₉H₈N₂O.

The characteristics of 1(2H)-Phthalazinone,4-methyl- are as followings: (1)ACD/LogP: 1.46; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 1.455; (4)ACD/LogD (pH 7.4): 1.455; (5)ACD/BCF (pH 5.5): 7.509; (6)ACD/BCF (pH 7.4): 7.509; (7)ACD/KOC (pH 5.5): 147.359; (8)ACD/KOC (pH 7.4): 147.357; (9)#H bond acceptors: 3; (10)#H bond donors: 1; (11)#Freely Rotating Bonds: 0; (12)Polar Surface Area: 41.46 Å²; (13)Index of Refraction: 1.644; (14)Molar Refractivity: 45.696 cm³; (15)Molar Volume: 126.167 cm³; (16)Polarizability: 18.115×10^-24cm³; (17)Surface Tension: 46.753 dyne/cm; (18)Density: 1.27 g/cm³. 

Uses of cis-2-Phenyl-1,3-dioxan-5-ol: It can be used to produce 4-methyl-2H-phthalazine-1-thione. This reaction will need reagent phoshorus pentasulfide, and the menstruum pyridine. The reaction time is 4.5 hours with heating, and the yield is about 75%.    

Addtionally, the following datas could be converted into the molecular structure:
(1)SMILES: Cc1c2ccccc2c(=O)[nH]n1
(2)InChI: InChI=1/C9H8N2O/c1-6-7-4-2-3-5-8(7)9(12)11-10-6/h2-5H,1H3,(H,11,12)
(3)InChIKey: QRNVHFPDZAZUGX-UHFFFAOYAZ