US PATENT SUBCLASS 546 / 43
.~.~.~.~.~ Two of the cyclos share at least three ring members (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}
42  DF  .~.~.~.~ Pentacyclo ring system having the six-membered hetero ring as one of the cyclos {3}
43.~.~.~.~.~ Two of the cyclos share at least three ring members (i.e., bridged) {1}
44  DF  .~.~.~.~.~.~> One of the five cyclos is five-membered and includes ring chalcogen (e.g., codeine, morphine, etc.) {2}

DEFINITION

Classification: 546/43

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

(under subclass 42) Compounds wherein at least three ring members of one cyclo are ring members of an additional cyclo in the pentacyclo ring system (i.e., bridged).

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