Gastrin and cholecystokinin receptor ligands (III)

Compounds of formula (I) and their pharmaceutically acceptable salts are ligands at gastrin and/or cholecystokinin receptors. X and Y are independently -N-, -N(R5)-(R5 being selected from H, Me, Et, Pr, Bn, OH and -CH2COOR6, wherein R6 represents H, Me, Et, Pr or Bn), -CH-, -O- or -S-; n is from 1 to 4; A is an optionally substituted 5- or 6-membered carbocyclic ring wherein (a) 1 or 2 C atoms may optionally be replaced by N, O and/or S atoms, (b) A is fused with the aromatic group in formula (I) to form a fused bicycle, and (c) the ring containing X and Y is linked to a C atom of A; R1 is H or C1 to C15 hydrocarbyl wherein up to three C atoms may optionally be replaced by N, O and/or S atoms and up to three H atoms may optionally be replaced by halogen atoms; R2 is selected from H, Me, Et, Pr and OH, each R2 being independently selected from H, Me, Et, Pr and OH when n is greater than 1; R3 (when n is 1) is selected from H, Me, Et and Pr; or (when n is greater than 1) each R3 is independently selected from H, Me, Et and Pr, or two R3 groups on neighbouring carbon atoms are linked to form a C3 to C6 carbocylic ring, or two R3 groups are absent from neighbouring carbon atoms which are linked by a double bond; or R2 and R3 on the same carbon atom together represent an -O group; R4 is C1 to C15 hydrocarbyl wherein up to two C atoms may optionally be replaced by N, O and/or S atoms and up to three H atoms may optionally be replaced by halogen atoms; V is -CO-NH-SO2-Ph, -SO2-NH-CO-PH, -CH2OH, or a group of the formula -R7U, (wherein U is -COOH, tetrazolyl, -CONHOH or -SO3H; and R7 is a bond; C1 to C6 hydrocarbylene optionally substituted by hydroxy, amino or acetamido; -O-(C1 to C3 alkylene)-; -SO2NR8-CHR9-; -CO-NR8-CHR9-, R8 and R9 being independently selected from H and methyl; or -NH-(CO)c-CH2, c being 0 or 1); or a pharmaceutically acceptable salt thereof. Compositions comprising a compound a formula (I) are also described