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 (107) nitrogen containing hetero ring attached indirectly to the cyclopentanohydrophenanthrene ring system by nonionic bonding (108) the hetero ring is five-membered and has plural hetero atoms
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