IN384547: Y-spiroketal-y-lactones and pharmaceutical composition containing same and process for preparation thereof

The invention relates to Y-spiroketal-y-lactones of formula (I) or a stereoisomer, ester, hydrate, solvate or pharmaceutically acceptable salt thereof and a pharmaceutically acceptable carrier, diluent or excipient and a process for preparation thereof. The invention further provides a pharmaceutical composition comprising y -spiroketal-y -lactones of formula (I) or a salt thereof.