but-2-enylene bisacrylate Bisacrylic acid 2-butene-1,4-diyl ester Diacrylic acid 2-butenylene ester Dipropenoic acid 2-butene-1,4-diyl ester 2-Butenediol 1,4-diacrylate 2-Propenoic acid, 1,1'-(2-butene-1,4-diyl) ester 2-Propenoic acid, 2-butene-1,4-diyl ester Einecs 242-448-1