US PATENT SUBCLASS 549 / 296
.~.~.~.~.~ Plural ring oxygens in the lactone ring

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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}
295  DF  .~.~.~.~ The lactone ring is five-membered {10}
296.~.~.~.~.~ Plural ring oxygens in the lactone ring

DEFINITION

Classification: 549/296

(under subclass 295) Compounds wherein the five-membered lactone ring contains at least two ring oxygens.

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