The Monoethyl maleate, with CAS registry number of 3990-03-2, has the systematic name of (2Z)-4-ethoxy-4-oxobut-2-enoic acid. And it is called Maleic acid monoethyl ester. C₆H₈O₄ is the chemical's molecular formula.

The characteristics of this chemical are as followings: (1)ACD/LogP: 0.29; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): -1.76; (4)ACD/LogD (pH 7.4): -3.25; (5)ACD/BCF (pH 5.5): 1; (6)ACD/BCF (pH 7.4): 1; (7)ACD/KOC (pH 5.5): 1; (8)ACD/KOC (pH 7.4): 1; (9)#H bond acceptors: 4; (10)#H bond donors: 1; (11)#Freely Rotating Bonds: 4; (12)Polar Surface Area: 52.6Ų; (13)Index of Refraction: 1.469; (14)Molar Refractivity: 33.24 cm³; (15)Molar Volume: 119.2 cm³; (16)Polarizability: 13.17×10^-24cm³; (17)Surface Tension: 42.4 dyne/cm; (18)Density: 1.208 g/cm³; (19)Flash Point: 109.6 °C; (20)Enthalpy of Vaporization: 54.97 kJ/mol; (21)Boiling Point: 261.6 °C at 760 mmHg; (22)Vapour Pressure: 0.0034 mmHg at 25°C.

Uses of cis-2-Phenyl-1,3-dioxan-5-ol: It can react with 3,5-dimethyl-1H-pyrazole to produce 4-(3,5-dimethyl-pyrazol-1-yl)-4-oxo-but-2-enoic acid ethyl ester. This reaction will need SOCl2, Et₃N, and the menstruum benzene. The reaction time is 2 hour, and the yield is about 68%.    

Addtionally, the following datas could be converted into the molecular structure:
(1)SMILES: O=C(O)\C=C/C(=O)OCC
(2)InChI: InChI=1/C6H8O4/c1-2-10-6(9)4-3-5(7)8/h3-4H,2H2,1H3,(H,7,8)/b4-3-
(3)InChIKey: XLYMOEINVGRTEX-ARJAWSKDBG