CPC Subgroup
C12P 17/06 containing a six-membered hetero ring, e.g. fluorescein
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 six-membered hetero ring, e.g. fluorescein