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 (200) hetero ring is four-membered containing nitrogen and having chalcogen double bonded directly to a ring carbon which is adjacent to the ring nitrogen (203) polycyclo ring system containing the hetero ring as one of the cyclos (302) the ring nitrogen is shared by a five-membered ring (303) the five-membered ring contains an additional hetero atom (347) bicyclo ring system which is 1-oxa-4-aza-bicyclo(3.2.0)hep-tane (including unsaturated) (348) acyclic carbon double bonded directly at the 2-position of the bicyclo ring system (349) chalcogen attached directly by a single bond to the carbon or to an acyclic carbon chain which contains the carbon
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