| abstract |
A compound of formula (IA) or a pharmaceutically acceptable salt thereof, wherein X is O, S, SO, SO2, CH2, CH or NR wherein R is hydrogen or C1-6 alkyl; A is a saturated or unsaturated polymethylene chain of 2-4 carbon atoms; R1 and R2 are hydrogen or C1-6 alkyl; R3 is hydrogen, halo, C1-6 alkyl, amino, nitro or C1-6 alkyl; R4 is hydrogen, halo, C1-6 alkyl or C1-6 alkoxy; Y is O or NH; Z is of sub-formula (a), wherein N<1> is 1, 2, 3 or 4; q is 0, 1, 2 or 3; R5 is 3-phenoxypropyl; or a compound of formula (IA) wherein the CO-Y linkage is replaced by a heterocyclic bioisostere; having 5-HT4 receptor antagonist activity. |