US PATENT SUBCLASS 549 / 279
.~.~.~.~.~.~.~ Ring oxygen bonded directly to ring carbon which is a member of two cyclos in the tetracyclo ring system

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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}
263  DF  .~.~.~ Lactones (i.e., -C(=X)O-, wherein X is chalcogen, is part of the hetero ring) {6}
273  DF  .~.~.~.~ The lactone ring is six-membered {6}
275  DF  .~.~.~.~.~ Polycyclo ring system having the lactone ring as one of the cyclos {3}
276  DF  .~.~.~.~.~.~ Tetracyclo ring system having the lactone ring as one of the cyclos {2}
279.~.~.~.~.~.~.~ Ring oxygen bonded directly to ring carbon which is a member of two cyclos in the tetracyclo ring system

DEFINITION

Classification: 549/279

(under subclass 276) Compounds wherein the tetracyclo ring system contains a ring oxygen bonded directly to a ring carbon, which carbon is a member of two of the cyclos in the tetracyclo ring system.

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