US PATENT SUBCLASS 549 / 300
.~.~.~.~.~.~.~ 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.)

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}
295  DF  .~.~.~.~ The lactone ring is five-membered {10}
297  DF  .~.~.~.~.~ Polycyclo ring system having the lactone ring as one of the cyclos {3}
299  DF  .~.~.~.~.~.~ Tricyclo ring system having the lactone ring as one of the cyclos {2}
300.~.~.~.~.~.~.~ 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: 549/300

(under subclass 299) 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) one ring carbon is a member of each of the cyclos of the tricyclo ring system.

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