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 (205) the ring nitrogen is shared by a six-membered ring (214) the six-membered ring contains sulfur (215) 1-thia-5-aza-bicyclo(4.2.0)octane (including unsaturated; e.g., cepham, etc.) (222) additional hetero ring containing (226) 3-position substituent contains sulfur (227) 7-position substituent contains hetero ring
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