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Heterocyclic compounds with 4 rings
9-Oxaergolines
Anthrapyrans
Coumestans
Dibenzoquinolines
Furonaphthodioxoles
Imidazopyrrolobenzodiazepines
Indolizinoindoles
Indolonaphthyridines
Indoloquinolines
Indoloquinolizines
Isoquinolinoisoquinolines
Morphinans
Naphthoisochromens
Noraporphines
Pterocarpans
Pyridopyrroloquinoxalines
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