US PATENT SUBCLASS 546 / 278.7
.~.~.~.~.~.~ Plural chalcogens attached directly to the five-membered hetero ring by nonionic bonding

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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}
278.4  DF  .~.~.~.~.~ Chalcogen attached directly to the five-membered hetero ring by nonionic bonding {1}
278.7.~.~.~.~.~.~ Plural chalcogens attached directly to the five-membered hetero ring by nonionic bonding

DEFINITION

Classification: 546/278.7

Plural chalcogens attached directly to the five-membered hetero ring by nonionic bonding:

(under subclass 278.4) Compounds wherein at least two chalcogens (i.e., oxygen, sulfur, selenium, or tellurium) are attached directly to the five-membered hetero ring by nonionic bonding.