This case discloses compounds of formula (I) wherein R1 is C1-6alkyl, haloC1-6alkyl, C2-6alkenyl, amino, monoC1-4alkylamino or diC1-4alkylamino; R2 and R3, which may be the same or different, are hydrogen, halogen, C1-6alkyl, haloC1-6alkyl, C1-4alkoxy, haloC1-4alkoxy, cyano or amino; each R4, which may be the same or different, is C1-6alkyl, halogen, haloC1-6alkyl, C1-4alkoxy, haloC1-4alkoxy, cyano, nitro or amino; p is 0, 1 or 2; each R5, which may be the same or different, is C1-6alkyl, halogen, haloC1-6alkyl, C1-4alkoxy, haloC1-4alkoxy, cyano, nitro or amino; q is 0, 1 or 2; R6 is —NR6aSO2R6b, —NR6aC(═O)R6b, —NR6a(C═O)N(R6c)2, —(C═O)R6d, —CH2NR6aSO2R6b, —CH2NR6aC(═O)R6b, CH2NR6a(C═O)N(R6c)2 or —CH2(C═O)R6d; where R6a and each R6c, which may be the same or different, is hydrogen or C1-6alkyl; R6b and R6d are C1-6alkyl or haloC1-6alkyl; or R6a and R6b, or R6a and R6c, together with the interconnecting atoms, may form a 5- or 6-membered ring; n is 1 or 2; and R7 and R8, which may be the same or different, are hydrogen, halogen, C1-6alkyl, haloC1-6alkyl, C1-4alkoxy, haloC1-4alkoxy, cyano or amino. It also discloses methods for preparing the compounds and their use in therapy such as treating schizophrenia.