1,3-Butanediol, dimethacrylate 1,3-Butylene dimethacrylate 63869-10-3 Methacrylic acid, 1,3-butylene ester (2:1) Methacrylic acid, 1-methyl-1,3-propylene ester Methacrylic acid, 3-methyl-1,3-propylene ester Methacrylic acid, isobutylene ester