| abstract |
Compounds of formula (I):n in which R 1 is hydrogen or C 1-5 alkyl; and R 2 and R 3 are hydrogen, C 1-4 alkyl, phenyl (CH 2 ) n where n is 0-3, C 5-6 cycloalkyl or C 3-5 alkenyl; intermediates and processes for their preparation, pharmaceutical compositions containing them and their use as selective serotonin receptor antagonists. |