US PATENT SUBCLASS 546 / 71
.~.~.~.~.~ Ring nitrogen is shared by two of the cyclos

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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}
26  DF  .~.~.~ Polycyclo ring system having the six-membered hetero ring as one of the cyclos {9}
61  DF  .~.~.~.~ Tetracyclo ring system having the six-membered hetero ring as one of the cyclos {5}
71.~.~.~.~.~ Ring nitrogen is shared by two of the cyclos {2}
72  DF  .~.~.~.~.~.~> Two of the cyclos share at least three ring members or a ring carbon is shared by three of the cyclos (i.e., bridged or peri-fused)
73  DF  .~.~.~.~.~.~> The six-membered hetero ring shares ring members with one other cyclo only (e.g., pyrrocolines, etc.)

DEFINITION

Classification: 546/71

Ring nitrogen is shared by two of the cyclos:

(under subclass 61) Compounds wherein the ring nitrogen of the six-membered hetero ring is a member of an additional cyclo in the tetracyclo ring system.

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