1,2-Benzenedicarboxylic acid, mono(1-methyl-2-((2-methyl-1-oxo-2-propenyl)oxy)ethyl) ester 1-Methyl-2-((2-methyl-1-oxoallyl)oxy)ethyl hydrogen phthalate 65859-45-2 EINECS 265-951-8 Methacryloxyisopropyl acid phthalate