| abstract |
The present invention relates to pyrazolopyrimidinones or pyrrolotriazinone derivatives, processes for their preparation and their use in medicine. Specifically, the present invention relates to a pyrazolopyrimidinone or a pyrrolotriazolone derivative represented by the formula (I), a pharmaceutically acceptable salt thereof, a process for the preparation thereof and a gonadotropin releasing hormone thereof (GnRH) receptor antagonists are particularly useful as therapeutic agents for endometriosis, wherein the definition of each substituent in the formula (I) is the same as defined in the specification.n□ |