US PATENT SUBCLASS 540 / 494
.~.~.~.~.~.~ Nitrogen of the hetero ring is shared by an additional cyclo of the tetracyclo ring system

Current as of: June, 1999
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540 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS {6}
484  DF  .~.~ The hetero ring contains seven members including nitrogen and carbon {14}
485  DF  .~.~.~ Chalcogen double bonded directly to a ring carbon adjacent to the ring nitrogen (e.g., caprolactam, etc.) {15}
492  DF  .~.~.~.~ Plural nitrogens in the hetero ring {3}
493  DF  .~.~.~.~.~ Tetracyclo ring system having the hetero ring as one of the cyclos {1}
494.~.~.~.~.~.~ Nitrogen of the hetero ring is shared by an additional cyclo of the tetracyclo ring system

DEFINITION

Classification: 540/494

(under subclass 493) Compounds wherein a nitrogen of the hetero ring is a member of two of the cyclos in the tetracyclo ring system.

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