Beecham-wuelfing Gmbh & Co. Kg

Dagmar Holtje

Dietrich Thielke

Guy Nadler

A compound of formula (I) or a pharmaceutically acceptable salt thereof: ##STR1## wherein: R.sub.1 is hydrogen, C.sub.1-6 alkyl, C.sub.1-6 alkoxy or halogen; R.sub.2 and R.sub.3 are both hydrogen or together represent a bond; R.sub.4 is hydrogen and R.sub.5 is hydrogen or R.sub.4 and R.sub.5 together represent an oxo group; R.sub.6 is phenyl, phenyl C.sub.1-7 alkyl or phenyl C.sub.1 -7 alkanoyl, in which the phenyl moiety is substituted by NR.sub.8 R.sub.9 wherein R.sub.8 is C.sub.1-6 alkyl substituted by a group R.sub.10 selected from hydroxy, halo, CF.sub.3 or COR.sub.11 where R.sub.11 is hydroxy, C.sub.1-4 alkoxy or amino optionally substituted by one or two C.sub.1-4 alkyl groups, and R.sub.9 is hydrogen, C.sub.1-6 alkyl or R.sub.8 ; and R.sub.7 is hydrogen or C.sub.1-4 alkyl.

Growing community of inventors

Gronau, Germany

Dagmar Holtje