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.) (233) polycyclo ring system having a 1,2-diazine ring as one of the cyclos
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Patent Apps in 544/233
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