(2-{2-[(Z)-2,3-Dibromo-4,4-bis-(4-ethyl-phenyl)-but-2-enoylamino]-acetylamino}-acetylamino)-acetic acid ethyl ester
[(Z)-2,3-Dibromo-4,4-bis-(4-ethyl-phenyl)-but-2-enoylamino]-acetic acid ethyl ester
2-[(Z)-2,3-Dibromo-4,4-bis-(4-ethyl-phenyl)-but-2-enoylamino]-3-phenyl-propionic acid ethyl ester
{2-[(Z)-2,3-Dibromo-4,4-bis-(4-ethyl-phenyl)-but-2-enoylamino]-acetylamino}-acetic acid ethyl ester
1-[(Z)-2,3-Dibromo-4,4-bis-(4-ethyl-phenyl)-but-2-enoylamino]-cyclohexanecarboxylic acid ethyl ester