US PATENT SUBCLASS 544 / 94
.~.~.~.~.~.~.~.~.~ Plural oxygens bonded directly to the oxazine ring 3,1-Benzoxazine-2,4- diones (including hydrogenated)

Current as of: June, 1999
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544 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {1}
*  DD  .~ 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}
1  DF  .~.~ Hetero ring is six-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazines, etc.) {6}
63  DF  .~.~.~ Six-membered hetero ring consists of oxygen, nitrogen and carbon (e.g., 1,2-oxazines, etc) {8}
88  DF  .~.~.~.~ 1,3-Oxazines {3}
89  DF  .~.~.~.~.~ Polycyclo ring system having the oxazine ring as one of the cyclos {2}
90  DF  .~.~.~.~.~.~ Bicyclo ring system having the oxazine ring as one of the cyclos {2}
92  DF  .~.~.~.~.~.~.~ Chalcogen bonded directly to the oxazine ring {1}
93  DF  .~.~.~.~.~.~.~.~ Plural oxygens bonded directly to the oxazine ring {1}
94.~.~.~.~.~.~.~.~.~ Plural oxygens bonded directly to the oxazine ring 3,1-Benzoxazine-2,4- diones (including hydrogenated)

DEFINITION

Classification: 544/94

(under subclass 93) Compounds which contain the isatoic anhydride configuration, wherein there may be double or single bonds between ring members. [figure]