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PCE
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DIFF Subgroup
A23K 20/116

Heterocyclic compounds

Introduced: January 2016

Full Title

Accessory food factors for animal feeding-stuffs > Organic substances > Heterocyclic compounds

IPC and CPC are identically structured here. All 3 subcodes exist in both systems.

IPC defines codes here since 2016.

Child Classifications

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  • A23K 20/132 containing only one nitrogen as hetero atom since 2016 IPC+CPC Available in IPC and CPC
  • A23K 20/137 containing two hetero atoms, of which at least one is nitrogen since 2016 IPC+CPC Available in IPC and CPC