US PATENT SUBCLASS 546 / 283.1
.~.~.~.~.~.~.~ Chalcogen attached directly to the additional 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}
281.7  DF  .~.~.~.~ Ring oxygen in the additional hetero ring {2}
282.1  DF  .~.~.~.~.~ The additional hetero ring is six-membered {2}
282.7  DF  .~.~.~.~.~.~ Polycyclo ring system having the additional hetero ring as one of the cyclos {1}
283.1.~.~.~.~.~.~.~ Chalcogen attached directly to the additional hetero ring by nonionic bonding

DEFINITION

Classification: 546/283.1

Chalcogen attached directly to the additional hetero ring by nonionic bonding:

(under subclass 282.7) Compounds wherein chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is attached directly to the additional hetero ring by nonionic bonding.

(1) Note. An example of a compound provided for herein is: [figure]