2-Butenedioic acid (2E)-, 1,4-dibutyl ester, polymer with ethenylbenzene and 1-ethyl hydrogen (2Z)-2-butenedioate 2-Butenedioic acid (2E)-, dibutyl ester, polymer with ethenylbenzene and ethyl hydrogen (2Z)-2-butenedioate 2-Butenedioic acid (2Z)-, monoethyl ester, polymer with dibutyl (2E)-2-butenedioate and ethenylbenzene 2-Butenedioic acid (E)-, dibutyl ester, polymer with ethenylbenzene and (Z)-ethyl hydrogen 2-butenedioate 2-Butenedioic acid (Z)-, monoethyl ester, polymer with (E)-dibutyl 2-butenedioate and ethenylbenzene Benzene, ethenyl-, polymer with dibutyl (2E)-2-butenedioate and ethyl hydrogen (2Z)-2-butenedioate Dibutyl fumarate-monoethyl maleate-styrene copolymer Dibutyl fumarate-monoethyl maleate-styrene polymer