US PATENT SUBCLASS 546 / 72
.~.~.~.~.~.~ 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)

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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  DF  .~.~.~.~.~ Ring nitrogen is shared by two of the cyclos {2}
72.~.~.~.~.~.~ 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)

DEFINITION

Classification: 546/72

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):

(under subclass 71) Compounds wherein at least three ring members of one cyclo are ring members of an additional cyclo or a ring carbon is a member of three of the cyclos in the tetracyclo ring system (i.e., bridged or peri-fused).

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