| abstract |
A compound of ** formula ** or a salt or solvate thereof, in which: R is a C1-6 straight or branched chain alkyl group, optionally substituted with up to three groups selected from the list consisting of alkoxy, amino, carboxy and their esters, cyano, hydroxy and halogen, C3-7 cycloalkyl optionally substituted with up to three groups selected from the list consisting of alkoxy, amino, carboxy and their esters, cyano, hydroxy and halogen, C1-6 alkoxy, hydroxy, halogen, a C2-6 straight or branched chain alkenyl group, optionally substituted with up to three groups selected from the list consisting of alkoxy, amino, carboxy and their esters, cyano, hydroxy and halogen, a C2-6 alkynyl group straight or branched chain, optionally substituted with up to three groups selected from the list consisting of alkoxy, amino, carboxy and their esters, cyano, hydroxy and halogen, amino, (C1-6) alkyl-amino, di-alkyl (C1 -6) -amino, hydroxyalkyl- (C1-6), (C1-alkoxy) -6) -C1-6 alkyl, aminoC1-6 alkyl, alkyl- (C1-6) -aminoalkyl (C1-6), di-alkyl (C1-6) -aminoalkyl (C1-6). |