Abstract: The invention relates to spirohydantoins of the formula I ##STR1## where R.sub.1 and R.sub.2 are defined hereinbelow. Also disclosed are methods of preparation, pharmaceutical compositions containing at least one of these compounds, and methods of using said compounds for treatment and prevention of complications of diabetes and galactosemia.

Abstract: This invention relates to heterocyclic amino-alcohol derivatives of the formula ##STR1## These compounds are useful as antihypertensives.

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.

Abstract: A salt of (+)-catechin formed of the reaction product of (+)-catechin with at least a basic amino-acid, such as L-lysine and L-arginine; a hydrosoluble double salt is formed by the reaction product of (+)-catechin with a basic amino-acid, such as L-lysine and L-arginine, and another inorganic or organic acid.