3.  Paragraph 1 of Part I of the said Schedule 2 shall be amended as follows:—

(a) the list of substances and products beginning with the word “Acetorphine” and ending with the words “4-Phenylpiperidine-4-carboxylic acid ethyl ester” shall be designated sub-paragraph (a), and accordingly the letter “(a)” shall be inserted before the word “Acetorphine”; and

(b) there shall be added at the end the following sub-paragraphs—

  

“(b) any compound (not being a compound for the time being specified in sub-paragraph (a) above) structurally derived from tryptamine or from a ring-hydroxy tryptamine by substitution at the nitrogen atom of the sidechain with one or more alkyl substituents but no other substituent;

  

(c) any compound (not being methoxyphenamine or a compound for the time being specified in sub-paragraph (a) above) structurally derived from phenethylamine, an N-alkylphenethylamine, a-methylphenethylamine, an N-alkyl-a-methylphenethylamine, a-ethylphenethylamine, or an N-alkyl-a-ethylphenethylamine by substitution in the ring to any extent with alkyl, alkoxy, alkylenedioxy or halide substituents, whether or not further substituted in the ring by one or more other univalent substituents.”.