the heterocyclic ring system containing a six-membered ring having oxygen as a ring hetero atom, e.g. rapamycin

Full Title

Medicinal preparations containing organic active ingredients > Heterocyclic compounds > having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins > having six-membered rings with one nitrogen as the only ring hetero atom > ortho- or peri-condensed with heterocyclic ring systems > the heterocyclic ring system containing a six-membered ring having oxygen as a ring hetero atom, e.g. rapamycin