The present invention relates to a compound of general formula (I) wherein R1, R2, and R3 represents one or more, same or different substituents selected from the group consisting of halogen, hydroxy, mercapto, trifluoromethyl, amino, (C1-C3)alkyl, (C2-C3)olefinic group, (C1-C3)alkoxy, (C1-C3)alkylthio, (C1-C6)alkylamino, (C1-C3)alkoxycarbonyl, cyano, -CONH2, phenyl, or nitro; further R2 can be hydrogen, and R3 can be carboxy and carbamoyl; R4 represents hydrogen, (C1-C3)alkyl, or allyl; X represents oxygen or sulphur; Q represents -(CO)-, -(CS)-, or a bond; Y represents (C5-C15)alkyl; (C2-C15)olefinic group; (C3-C10)monocyclic hydrocarbon group; or phenyl; any of which may be optionally substituted by one or more, same or different substituents selected from the group consisting of the formula R5 defined below; (C1-C4)alkyl substituted by one or more substituents selected for the group R5; or a group of the formula -(Z-O)n-Z, wherein Z is a (C1-C3)alkyl, n is an integer > 1; and no continuous linear sequence of atoms in the group Y exceeds 15; R5 represents halogen, hydroxy, mercapto, trifluoromethyl, amino, (C1-C3)alkoxy, (C1-C3)alkylthio, (C1-C6)alkylamino, (C1-C3)alkoxycarbonyl, cyano, azido, nitro, -COOH, -CONH2, -CONHR', or COONR'R' wherein R' represents (C1-C3)alkyl; or a pharmaceutically acceptable salt thereof, or a hydrate or solvate thereof. The compounds are valuable in the human and veterinary therapy.