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All pyranonaphtoquinones contain either the naphtha[2,3-c]pyran-5,10-dione (32) or the regioisomeric naphtha[2,3-c]pyran-6,9-dione (33) unit. Representative examples are actinorhodin (34), medermycin (35), granaticin (36) and alnumycin A (37) [21].
