| 摘要 |
Compounds of general formula:
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in which:
X denotes
either an oxygen atom,
or two hydrogen atoms;
Y denotes
either a hydrogen atom
or a hydroxyl group;
or Y denotes an amino group on condition that X denotes two hydrogen atoms.
R denotes a hydrogen atom, an alkyl group of 1 to 6 carbon atoms in a straight or branched chain, optionally substituted by one or more hydroxyl, amino, mercapto, methylthio, carboxyl or aryl groups such as phenyl, pyridyl or thienyl.
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denotes a nitrogen-containing polycyclic structure, their enantiomers, epimers and diastereoisomers and their addition salts with a pharmaceutically acceptable acid or base.
<??>Medications.
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