US PATENT SUBCLASS 546 / 298
.~.~.~.~ Having -C(=X)-, wherein X is chalcogen, bonded directly to the six-membered hetero ring

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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}
290  DF  .~.~.~ Chalcogen bonded directly to ring carbon of the six-membered hetero ring {9}
298.~.~.~.~ Having -C(=X)-, wherein X is chalcogen, bonded directly to the six-membered hetero ring {1}
299  DF  .~.~.~.~.~> Plural -C(=X)- groups, wherein X is chalcogen, bonded directly to the six membered hetero ring

DEFINITION

Classification: 546/298

Having -C(=X)-, wherein X is chalcogen, bonded directly to the six-membered hetero ring:

(under subclass 290) Compounds wherein a group, in which X is chalcogen (i.e., oxygen, sulfur, selenium, or tellurium), is bonded directly to the six-membered hetero ring.

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