| abstract |
The derivatives of the formula: ##STR1## wherein: R 1 is H or C 1 -C 4 alkyl; n X is an oxygen atom, a methylene group or a --CH═CH-- group; n n is 1 or 2 when X is an oxygen atom or a methylene group and 0 or 1 when X is a --CH═CH-- group; n D is an oxygen atom or a NOR group, wherein R═H or C 1 -C 4 alkyl; n R 3 is a C 1 -C 4 alkyl, C 3 -C 7 cycloalkyl, phenyl or benzyl group; n each of R 2 and R' 2 independently is a hydrogen atom or a C 1 -C 4 alkyl, C 3 -C 7 cycloalkyl, phenyl or benzyl group; and n R' 2 and R 3 may further form together a --(CH 2 ) 3 -- or --(CH 2 ) 4 -- chain, n useful as drugs. |