US PATENT SUBCLASS 549 / 278
.~.~.~.~.~.~.~.~ At least two additional chalcogens bonded directly to the tetracyclo ring system

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}
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}
277  DF  .~.~.~.~.~.~.~ The tetracyclo ring system consists of four six-membered cyclos {1}
278.~.~.~.~.~.~.~.~ At least two additional chalcogens bonded directly to the tetracyclo ring system

DEFINITION

Classification: 549/278

(under subclass 277) Compounds in which two or more additional chalcogens (i.e., oxygen, sulfur, selenium, or tellurium) are bonded directly to the tetracyclo ring system.

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