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PCE
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CPC Subgroup
C12P 17/04

containing a five-membered hetero ring, e.g. griseofulvin

Full Title

Preparation of heterocyclic carbon compounds with only O, N, S, Se or Te as ring hetero atoms (C12P13/04 - C12P13/24 take precedence) > Oxygen as only ring hetero atoms > containing a five-membered hetero ring, e.g. griseofulvin