Novel (E)-1-[4'-(2-alkylaminoethoxy)phenyl]-1- (3'-hydroxyphenyl)-2-phenylbut-1-enes of the general formula ##STR1## wherein R1 and R2 may be the same or different, provided that, when R1 and R2 are the same, each of them is a methyl or ethyl radical, and when R1 and R2 are different, one of them is hydrogen and the other is a methyl or ethyl radical, and the therapeutically compatible salts there