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) (88) 1,3-oxazines (89) polycyclo ring system having the oxazine ring as one of the cyclos (90) bicyclo ring system having the oxazine ring as one of the cyclos (92) chalcogen bonded directly to the oxazine ring (93) plural oxygens bonded directly to the oxazine ring (94) plural oxygens bonded directly to the oxazine ring 3,1-benzoxazine-2,4- diones (including hydrogenated)
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