US PATENT SUBCLASS 546 / 268.4
.~.~.~.~ The additional hetero ring is five-membered having two or more ring hetero atoms of which at least one is nitrogen


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546 /   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 consisting of one nitrogen and five carbons {24}
268.1  DF  .~.~.~ Additional hetero ring containing {4}
268.4.~.~.~.~ The additional hetero ring is five-membered having two or more ring hetero atoms of which at least one is nitrogen {9}
268.7  DF  .~.~.~.~.~> Thiadiazoles (including hydrogenated)
269.1  DF  .~.~.~.~.~> Oxadiazoles (including hydrogenated) {1}
269.7  DF  .~.~.~.~.~> 1,3-thiazoles (including hydrogenated) {3}
271.1  DF  .~.~.~.~.~> 1,2-thiazoles (including hydrogenated)
271.4  DF  .~.~.~.~.~> 1,3-oxazoles (including hydrogenated) {1}
272.1  DF  .~.~.~.~.~> 1,2-oxazoles (including hydrogenated)
272.4  DF  .~.~.~.~.~> 1,2,4-triazoles (including hydrogenated)
272.7  DF  .~.~.~.~.~> 1,3-diazoles (including hydrogenated) {5}
275.4  DF  .~.~.~.~.~> 1,2-diazoles (including hydrogenated) {2}


DEFINITION

Classification: 546/268.4

The additional hetero ring is five-membered having two or more ring hetero atoms of which at least one is nitrogen:

(under subclass 268.1) Compounds wherein the additional hetero ring is five-membered and has two or more ring hetero atoms of which at least one is nitrogen.

(1) Note. Examples of compounds provided for herein are: [figure] [figure]