Abstract: Novel compounds of formula (1) together with their salts and solvates have a number of uses in medicine, in particular as central muscle relaxants.

Abstract: Novel compounds of formula (I) ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each selected from hydrogen and fluoro and at least one and not more than two is fluoro;R.sup.5 is selected from hydrogen and C.sub.1 -C.sub.4 alkyl;R.sup.6 is selected from hydrogen, C.sub.1 -C.sub.4 ally and hydroxy; orR.sup.5 and R.sup.6 together with the ring carbon form a carbonyl group;R.sup.7 is selected from hydrogen and hydroxy,R.sup.8 and R.sup.9 are each selected from hydrogen, C.sub.1 -C.sub.4 alkyl and cyclo(C.sub.3 or C.sub.4) alkyl or together with the nitrogen form a morpholino group; andX is selected from a bond, methylene and --O-- and is always a bond or --O-- when any of R.sup.5, R.sup.6 and R.sup.7 is other than hydrogen and is always a bond when R.sup.5 and R.sup.6 together with the ring carbon form a carbonyl group;and their salts and solvates have a number of uses as central muscle relaxants. In particular, treatment of conditions associated with abnormally raised skeletal muscle tone.