The term 'addition' in s 314.4(2)(d) of the Criminal Code (Cth) bears its ordinary English meaning, not the narrower technical chemistry meaning of 'addition reaction'. This means a structural modification involving the joining of a chemical group to a listed drug qualifies under para (d) even if the process results in the loss of atoms. The qualification 'substantially similar in chemical structure' in s 314.4(2)(f) applies to all four terms in that paragraph, limiting the scope of 'homologue', 'analogue' and 'chemical derivative' as well as 'substance'.
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