US PATENT SUBCLASS 546 / 63
.~.~.~.~.~.~ Two of the cyclos share at least three ring member (i.e., bridged)

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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}
62  DF  .~.~.~.~.~ Plural ring hetero atoms in the tetracyclo ring system (e.g., acronycines, etc.) {4}
63.~.~.~.~.~.~ Two of the cyclos share at least three ring member (i.e., bridged)

DEFINITION

Classification: 546/63

Two of the cyclos share at least three ring members (i.e., bridged):

(under subclass 62) Compounds wherein at least three ring members of one cyclo are ring members of an additional cyclo in the tetracyclo ring system (i.e., bridged).

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