14533-68-7 2-Butenedioic acid (2Z)-, mono(2-cyanoethyl) ester 2-Butenedioic acid (Z), mono(2-cyanoethyl) ester 2-Butenedioic acid (Z)-, mono(2-cyanoethyl) ester EINECS 238-565-2 Maleic acid, ester with hydracrylonitrile Mono(2-cyanoethyl) maleate