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.) (63) six-membered hetero ring consists of oxygen, nitrogen and carbon (e.g., 1,2-oxazines, etc) (98) 1,4-oxazines (106) morpholines (i.e., fully hydrogenated 1,4-oxazines (111) additional nitrogen containing hetero ring (e.g., thiazetidine, etc.) (132) five-membered hetero ring having two or more ring hetero atoms of which at least one is nitrogen (139) 1,3-diazole ring (including hydrogenated)
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