US PATENT SUBCLASS 544 / 48
.~.~.~.~.~.~ Three or more ring hetero atoms in the bicyclo ring system

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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}
3  DF  .~.~.~ Six-membered hetero ring consists of oxygen, sulfur, nitrogen and carbon (e.g., oxathiazines, etc.) {7}
14  DF  .~.~.~.~ Polycyclo ring system having the six-membered hetero ring as one of the cyclos {3}
47  DF  .~.~.~.~.~ Bicyclo ring system having the six-membered hetero ring as one of the cyclos {2}
48.~.~.~.~.~.~ Three or more ring hetero atoms in the bicyclo ring system

DEFINITION

Classification: 544/48

(under subclass 47) Compounds wherein the bicyclo ring system contains at least one ring hetero atom in addition to the ring sulfur and ring nitrogen of the thiazine ring.

(1) Note. An example of a structure provided for herein is: [figure]