US PATENT SUBCLASS 549 / 232
.~.~.~.~ The cyclic anhydride has at least six members and is a cyclo in a polycyclo 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}
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}
232.~.~.~.~ The cyclic anhydride has at least six members and is a cyclo in a polycyclo ring system

DEFINITION

Classification: 549/232

(under subclass 231) Compounds wherein the cyclic anhydride has at least six ring members and is one of the cyclos in a polycyclo ring system.

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