Description: 544 organic compounds -- part of the class 532-570 series / 544 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 having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazines, etc.) (224) the six-membered hetero ring consists of two nitrogens and four carbons (e.g., 1,2-diazines, etc.) (242) 1,3-diazines (245) polycyclo ring system having the diazine ring as one of the cyclos (249) tricyclo ring system having the diazine ring as one of the cyclos (252) ring nitrogen is shared by two of the cyclos
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