The New Zealand drug laws include a long section under Schedule 3 with a series of definitions of "Analogues". See Schedule 3 : Part 7. The following appears to be the only qualifying factors that reduce the incredibly (un-believable) broad scope of those definitions:

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From: http://www.legislation.govt.nz/libraries/contents/om_isapi.dll?clientID=1339304317&hitsperheading=on&infobase=pal_statutes.nfo&jump=a1975-116%2fs.29c&softpage=DOC#JUMPDEST_a1975-116/s.29c

Misuse of Drugs Act 1975:
[29C.Special provisions where offence relating to controlled drug alleged analogues
It shall be a defence to a charge relating to the possession of any controlled drug analogue in contravention of any of the provisions of this Act if the defendant proves that he or she had substance the

• (a)For some purpose than other than --
  
  • (i)Consuming, smoking, snorting, or injecting by any person, or using in any other manner intended to have a pharmacological effect on the user; and
  • (ii)Supplying or administering it to any other person; or
• (b)For the purpose of supplying it or administering it to any other person in accordance with any procedure approved by the Director-General of Health.]