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 (304) 1-thia-4-aza-bicyclo(3.2.0)hep-tane (including unsaturated; e.g., penam, etc.) (310) having -c(=x)-, wherein x is chalcogen, bonded directly at the 3-position of the bicyclo ring system (312) nitrogen bonded directly at the 6-position of the bicyclo ring system (314) having -c(=x)-, wherein x is chalcogen, single bonded directly to the nitrogen (e.g., penicillin f, etc.) (315) processes utilizing penam containing compound (319) sulfur-oxidation, epimerization, 6-alkoxylation, de-esterification or reduction
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