US PATENT SUBCLASS 544 / 91
.~.~.~.~.~.~.~ Three or more ring hetero atoms in the bicyclo ring system

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}
91.~.~.~.~.~.~.~ Three or more ring hetero atoms in the bicyclo ring system

DEFINITION

Classification: 544/91

(under subclass 90) Compounds wherein the bicyclo ring system includes at least one ring hetero atom in addition to the ring oxygen and ring nitrogen of the six-membered hetero ring.