US PATENT SUBCLASS 544 / 7
.~.~.~.~ Plural nitrogens in the six-membered hetero ring (e.g., thiatriazines, etc.)

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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}
7.~.~.~.~ Plural nitrogens in the six-membered hetero ring (e.g., thiatriazines, etc.) {1}
8  DF  .~.~.~.~.~> Thiadiazines {1}

DEFINITION

Classification: 544/7

(under subclass 3) Compounds wherein the six-membered hetero ring contains at least two atoms of nitrogen in addition to the sulfur and carbon.