US PATENT SUBCLASS 548 / 517
.~.~.~ Additional hetero ring, which is attached directly or indirectly to the five-membered hetero ring by nonionic bonding

Current as of: June, 1999
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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}
517.~.~.~ Additional hetero ring, which is attached directly or indirectly to the five-membered hetero ring by nonionic bonding {3}
518  DF  .~.~.~.~> The additional hetero ring also contains nitrogen {2}
525  DF  .~.~.~.~> Polycyclo ring system which includes ring chalcogen {1}
527  DF  .~.~.~.~> Sulfur containing hetero ring

DEFINITION

Classification: 548/517

(under subclass 400) Compounds wherein an additional hetero ring is attached directly or indirectly to the five-membered

hetero ring by nonionic bonding.

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