1-Piperazineacetic acid, 4-(2,4-dichlorocinnamoyl)-, ethyl ester, hydrochloride 27897-25-2 4-(2',4'-Dichlorocinnamoyl)-1-(ethoxycarbonylmethyl)piperazine hydrochloride 4-(2,4-Dichlorocinnamoyl)-1-piperazineacetic acid ethyl ester hydrochloride