Description: 546 organic compounds -- part of the class 532-570 series / 546 organic compounds -- part of the class 532-570 series/() organic compounds (class 532, subclass 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 (class 540, subclass 1) (1) hetero ring is six-membered consisting of one nitrogen and five carbons (26) polycyclo ring system having the six-membered hetero ring as one of the cyclos (61) tetracyclo ring system having the six-membered hetero ring as one of the cyclos (71) ring nitrogen is shared by two of the cyclos (72) two of the cyclos share at least three ring members or a ring carbon is shared by three of the cyclos (i.e., bridged or peri-fused)
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