4BMeaning of drug analogue

4B Meaning of drug analogue A drug analogue is a substance, however obtained, that in relation to a dangerous drug is: (a) a stereo-isomer; or (b) a structural isomer having the same constituent groups; or (c) a homologue; or (d) a chemical derivative formed by a chemical process (for example, conversion of a carboxylic acid to an ester or an amine to an amide); or Misuse of Drugs Act 1990 9 (e) a structural modification obtained by the replacement of one or more of the following groups with another such group or groups, where the group is attached to oxygen, nitrogen, sulphur, phosphorus or carbon: (i) alkoxy, cyclic diether, carbonyl, acyl, carboxylic acid, acyloxy, mono-alkylamino or di-alkylamino groups with up to 6 carbon atoms in any alkyl residue; (ii) alkyl, alkenyl or alkynyl groups with up to 6 carbon atoms in the group; (iii) hydrogen atom, halogen, hydroxy, nitro or amino groups; or (f) a structural modification obtained in one or more of the following ways: (i) by the replacement of up to 2 carbocyclic or heterocyclic ring structures with up to 2 different carbocyclic or heterocyclic ring structures; (ii) by the addition of hydrogen atoms to one or more unsaturated bonds.