NOVEL COMPOUNDS, THEIR SYNTHESIS AND THEIR USES

摘要

The present invention discloses novel chemical compounds obtained by causing a covalent attachment of a modifying agent of the structure provided for formula 1, to a functional group or a heteroatom of a heterocyclic ring system in chemical compound with improved chemical and biological properties. Wherein: Y is DRUG-CO; DRUG -OCO; DRUG-NRCO, and X is selected from.