A compound of Formula (I), or a pharmaceutically acceptable salt or solvate thereof, (I) wherein, R1 and R2 each independently represent H, halogen, CF3, C1-3 alkyl or C1-3 alkoxy R3 represents C1-6 alkyl, C3-6 cycloalkyl, phenyl (optionally substituted by one or more substituents each independently selected from Ra) or Het (optionally substituted by one or more substituents each independently selected from OH, oxo, or C1-4 alkyl) R4 represents H or C1-3 alkyl R5 represents C1-6 alkyl (optionally substituted by one or more substituents each independently selected from Rb), C3-6 cycloalkyl (optionally substituted by one or more substituents each independently selected from oxo or OH), or Het2 (optionally substituted by one or more substituents each independently selected from Rd) oxygen atom or 1 sulphur atom, or (c) 1 oxygen atom or 1 sulphur atom, (optionally substituted by one or more substituents each independently selected from OH, oxo or C1-4 alkyl) and R6 represents C1-3 alkyl (optionally substituted by one or more substituents each independently selected from Rf), C3-5 cycloalkyl (optionally substituted by one or more halogen), CN or halogen where Rf represents halogen or phenyl: and compositions, processes for the preparation, and uses thereof, e.g. in the treatment of endometriosis or uterine fibroids.La présente invention concerne un composé de formule (I), ou un sel ou un solvate pharmaceutiquement acceptables de celui-ci, (I) dans laquelle, R1 et R2 représentent chacun indépendamment H, un halogène, CF3, un alkyle en C1 à C3 ou un alcoxy en C1 à C3 R3 représente un alkyle en C1 à C6, un cycloalkyle en C3 à C6, un phényle (éventuellement substitués par un ou plusieurs substituants chacun indépendamment choisi parmi Ra) ou Het (éventuellement substitué par un ou plusieurs substituants chacun indépendamment choisi parmi OH, un oxo, ou un alkyle en C1 à C4) R4 représente H ou un alkyle en C1 à C3 R5 représente un alkyle en C1 à C6 (éventuellement substitué p
