US PATENT SUBCLASS 544 / 3
.~.~.~ Six-membered hetero ring consists of sulfur, nitrogen and carbon (e.g., thiazines, 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.~.~.~ Six-membered hetero ring consists of sulfur, nitrogen and carbon (e.g., thiazines, etc.) {7}
4  DF  .~.~.~.~> Heavy metal or aluminum containing
5  DF  .~.~.~.~> Plural sulfurs in the six-membered hetero ring (e.g., dithiazines, etc.)
6  DF  .~.~.~.~> Spiro
7  DF  .~.~.~.~> Plural nitrogens in the six-membered hetero ring (e.g., thiatriazines, etc.) {1}
14  DF  .~.~.~.~> Polycyclo ring system having the six-membered hetero ring as one of the cyclos {3}
53  DF  .~.~.~.~> 1,3-thiazines {2}
56  DF  .~.~.~.~> 1,4-thiazines {3}

DEFINITION

Classification: 544/3

(under subclass 1) Compounds wherein the six- membered hetero ring includes at least one atom each of sulfur, nitrogen and carbon and contains no other elements as ring members.