US PATENT SUBCLASS 549 / 459
.~.~.~.~.~.~ Two of the cyclos share at least three ring members (i.e., bridged)

Current as of: June, 1999
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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}
429  DF  .~.~.~ The hetero ring is five-membered {14}
456  DF  .~.~.~.~ Polycyclo ring system having the hetero ring as one of the cyclos {3}
458  DF  .~.~.~.~.~ Tricyclo ring system having the hetero ring as one of the cyclos {2}
459.~.~.~.~.~.~ Two of the cyclos share at least three ring members (i.e., bridged)

DEFINITION

Classification: 549/459

(under subclass 458) Compounds wherein at least three ring members of one cyclo are ring members of an additional cyclo in the tricyclo ring system.

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