US PATENT SUBCLASS 548 / 460
.~.~.~.~.~.~.~ Ring carbon of each of the two five-membered hetero rings is bonded directly to chalcogen or nitrogen (e.g., both rings may be bonded to the same nitrogen atom or to different nitrogen atoms, etc.)

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548 /   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) {4}
400  DF  .~.~ Hetero ring is five-membered consisting of one nitrogen and four carbons (e.g., halopyrrolidines, etc.) {20}
416  DF  .~.~.~ Polycyclo ring system having the five-membered hetero ring as one of the cyclos {5}
452  DF  .~.~.~.~ Bicyclo ring system having the five-membered hetero ring as one of the cyclos (e.g., octahydroindoles, etc.) {7}
454  DF  .~.~.~.~.~ Additional polycyclo heterocyclic ring system attached directly or indirectly to the bicyclo ring system by nonionic bonding {3}
455  DF  .~.~.~.~.~.~ The additional polycyclo ring system includes a five-membered nitrogen containing hetero ring {3}
460.~.~.~.~.~.~.~ Ring carbon of each of the two five-membered hetero rings is bonded directly to chalcogen or nitrogen (e.g., both rings may be bonded to the same nitrogen atom or to different nitrogen atoms, etc.) {1}
461  DF  .~.~.~.~.~.~.~>.~ Plural chalcogens bonded directly to ring carbons of each of the two five membered hetero rings (e.g., bisphthalimides, etc.) {1}

DEFINITION

Classification: 548/460

(under subclass 455) Compounds wherein a ring carbon of each of the two five-membered hetero rings is bonded directly to chalcogen (i.e., oxygen, sulfur, selenium, or tellurium), or nitrogen.

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