4 résultats
BRIEF DESCRIPTION OF THE INVENTION
The present invention is directed to compounds of the formula ##STR2## and pharmaceutically acceptable salts thereof. As used in formula I, and throughout the specification, the symbols have the following meanings:
A is a bond or --OCH.sub.2 --, where the oxygen is
BRIEF DESCRIPTION OF THE INVENTION
The present invention is directed to compounds of the formula I ##STR5##
and pharmaceutically acceptable salts thereof. As used in formula I, and throughout the specification, the symbols have the following meanings: R.sup.1 is lower alkyl, aryl or arylalkyl; A is
BRIEF DESCRIPTION OF THE INVENTION
The present invention is directed to compounds of the formula ##STR2## and pharmaceutically acceptable salts thereof. As used in formula I, and throughout the specification, the symbols have the following meanings:
R.sup.1, R.sup.2 and R.sup.3 are independently
BRIEF DESCRIPTION OF THE INVENTION
The present invention is directed to compounds of the formula ##STR2## and pharmaceutically acceptable salts thereof. As used in formula I, and throughout the specification, the symbols have the following meanings:
R.sup.1, R.sup.2 and R.sup.3 are independently