DIETHYL(3-ETHOXYCARBONYL-2-METHYL-PROP-2-ENYL)PHOSPHONATE;TRIETHYL 3-METHYL-4-PHOSPHONO-2-BUTENOATE;TRIETHYL 3-METHYL-4-PHOSPHONOCROTONATE;TRIETHYL 4-PHOSPHONOSENECIOATE;triethyl 3-methyl-4-phosphono-2-buten-oate (cis+trans);TRIETHYL-3-METHYLPHOSPHONOCROTONATE;TRIETHYL 3-METHYL-4-PHOSPHONOCROTONATE, TECH., 80%, MIXTURE OF CIS AND TRANS;triethyl 3-methyl-4-phosphono-2-butenoate, mixture of cis and trans