Description: 540 organic compounds -- part of the class 532-570 series / 540 organic compounds -- part of the class 532-570 series/() organic compounds (class 532, subclass 1) (1) heterocyclic carbon compounds containing a hetero ring having chalcogen (i.e., oxygen, sulfur, selenium or tellurium) or nitrogen as the only ring hetero atoms (2) cyclopentanohydrophenanthrene ring system containing (94) hetero ring attached directly to the cyclopentanohydrophenanthrene ring system by nonionic bonding (102) the hetero ring contains -c(=x)-o-, wherein x is chalcogen, as part of the ring (e.g., lactones, etc.) (103) additional chalcogen, cyano, or -c(=x)-, wherein x is chalcogen, bonded directly to the hetero ring
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