IUPAC Name: Methyl 2-[4-(4-chlorophenyl)phenoxy]-2-methylpropanoate
Synonyms of Methyl clofenapate (CAS NO.21340-68-1): Methyl-2-(4-(p-chlorophenyl)phenoxy)-2-methylpropionate ; Propanoic acid, 2-((4'-chloro(1,1'-biphenyl)-4-yl)oxy)-2-methyl-, methyl ester ; Propanoic acid, 2-((4'-chloro(1,1'-biphenyl)-4-yl)oxy)-2-methyl-, methyl ester (9CI)
CAS NO: 21340-68-1
Molecular Formula: C₁₇H₁₇ClO₃
Molecular Weight : 304.7681
Molecular Structure:
H bond acceptors: 3
H bond donors: 0
Freely Rotating Bonds: 5
Polar Surface Area: 35.53 Å²
Index of Refraction: 1.548
Molar Refractivity: 82.69 cm³
Molar Volume: 260.2 cm³
Surface Tension: 39.4 dyne/cm
Density: 1.171 g/cm³
Flash Point: 151.5 °C
Enthalpy of Vaporization: 65.89 kJ/mol
Boiling Point: 407 °C at 760 mmHg
Vapour Pressure: 7.77E-07 mmHg at 25°C 
Appearance: White powder.

Questionable carcinogen with experimental carcinogenic data. When Methyl clofenapate (CAS NO.21340-68-1) is heated to decomposition, it emits toxic fumes of Cl⁻.

Reactivity Profile : A halogenated ester derivative. Esters react with acids to liberate heat along with alcohols and acids. Strong oxidizing acids may cause a vigorous reaction that is sufficiently exothermic to ignite the reaction products. Heat is also generated by the interaction of esters with caustic solutions. Flammable hydrogen is generated by mixing esters with alkali metals and hydrides.