1-Phenylcyclohexylamine or any compound (not being ketamine, tiletamine or a compound for the time being specified in paragraph 1(a) of Part 1 of this Schedule) structurally derived from 1-Phenylcyclohexylamine or 2-Amino-2-phenylcyclohexanone by modification in any of the following ways, that is to say, < ol>< li>by substitution at the nitrogen atom to any extent by alkyl, alkenyl or hydroxyalkyl groups, or replacement of the amino group with a 1-piperidyl, 1-pyrrolidyl or 1-azepyl group, whether or not the nitrogen containing ring is further substituted by one or more alkyl groups;

by substitution in the phenyl ring to any extent by amino, alkyl, hydroxy, alkoxy or halide substituents, whether or not further substituted in the phenyl ring to any extent

by substitution in the cyclohexyl or cyclohexanone ring by one or more alkyl substituents;

by replacement of the phenyl ring with a thienyl ring.