Abstract: The new amino-alcohol derivatives according to the invention have the formula: ##STR1## wherein: (a) R.sub.1 is hydrogen, an alkylthio C.sub.1 -C.sub.5 radical, a cycloalkylthio C.sub.5 -C.sub.6 radical, an alkoxy C.sub.1 -C.sub.5 radical, a cycloalkyloxy C.sub.5 -C.sub.6 radical, an alkyl C.sub.1 -C.sub.5 radical, a cycloalkyl C.sub.5 -C.sub.6 radical or a halogen atom;(b) R.sub.2 is a lower alkyl C.sub.1 -C.sub.3 radical;(c) R.sub.3 is an alkyl C.sub.1 -C.sub.18 radical, substituted or not, an alkenyl C.sub.6 -C.sub.18 radical substituted or not, a cycloalkyl C.sub.5 -C.sub.9 radical;(d) R.sub.4 is an acyl group having the formula: ##STR2## in which R.sub.5 represents an alkyl C.sub.1 -C.sub.10 substituted or not, an alkenyl C.sub.2 -C.sub.4, a cycloalkyl C.sub.3 -C.sub.8, a phenyl substituted or not or a cinnamyl radical, R.sub.4 being hydrogen if R.sub.1 is hydrogen, an alkyl, alkoxy, cycloalkoxy or cycloalkyl radical or a halogen atom.