US PATENT SUBCLASS 549 / 237
.~.~.~.~.~.~.~ Two of the cyclos share at least three ring members (i.e., bridged)

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549 /   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) {2}
200  DF  .~.~ Oxygen containing hetero ring (e.g., dioxirane, etc.) {16}
231  DF  .~.~.~ Cyclic anhydrides (i.e., -C(=X)OC(=X)-, wherein the X's are the same or diverse chalcogens, is part of the hetero ring) {2}
233  DF  .~.~.~.~ The cyclic anhydride is five-membered (e.g., succinic anhydride, etc.) {7}
234  DF  .~.~.~.~.~ Polycyclo ring system having the cyclic anhydride as one of the cyclos {3}
236  DF  .~.~.~.~.~.~ Tricyclo ring system having the cyclic anhydride as one of the cyclos {2}
237.~.~.~.~.~.~.~ Two of the cyclos share at least three ring members (i.e., bridged) {1}
238  DF  .~.~.~.~.~.~.~>.~ Halogen bonded directly to the tricyclo ring system

DEFINITION

Classification: 549/237

(under subclass 236) Compounds wherein at least three ring members of one cyclo are ring members of an additional cyclo in the tricyclo ring system (i.e., bridged).

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