US PATENT SUBCLASS 549 / 281
.~.~.~.~.~.~.~ Two of the cyclos share at least three ring members or ring carbon is shared by the three cyclos (e.g., bridged or peri compounds, etc.)


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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}
280  DF  .~.~.~.~.~.~ Tricyclo ring system having the lactone ring as one of the cyclos {2}
281.~.~.~.~.~.~.~ Two of the cyclos share at least three ring members or ring carbon is shared by the three cyclos (e.g., bridged or peri compounds, etc.)


DEFINITION

Classification: 549/281

(under subclass 280) Compounds wherein (1) at least three ring members of one cyclo are ring members of an additional cyclo in the tricyclo ring system, or (2) a ring carbon is a member of each of the cyclos of the tricyclo ring system.

(1) Note. This subclass provides for bridged and peri-fused ring systems.

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