US PATENT SUBCLASS 546 / 278.1
.~.~.~.~.~.~.~ Having -C(=X)-, wherein X is chalcogen, bonded directly to the five- 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}
268.1  DF  .~.~.~ Additional hetero ring containing {4}
276.4  DF  .~.~.~.~ The additional hetero ring is five-membered consisting of one nitrogen and four carbons {4}
276.7  DF  .~.~.~.~.~ Polycyclo ring system having the five-membered hetero ring as one of the cyclos {2}
277.4  DF  .~.~.~.~.~.~ Bicyclo ring system which is indole (including hydrogenated) {2}
278.1.~.~.~.~.~.~.~ Having -C(=X)-, wherein X is chalcogen, bonded directly to the five- membered hetero ring

DEFINITION

Classification: 546/278.1

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

(under subclass 277.4) Compounds in which -C(=X)-, wherein X is chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is bonded directly to the five-membered hetero ring.