US PATENT SUBCLASS 549 / 435
.~.~.~.~.~.~.~ Plural hetero rings

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}
429  DF  .~.~.~ The hetero ring is five-membered {14}
430  DF  .~.~.~.~ Plural ring oxygens in the hetero ring {8}
432  DF  .~.~.~.~.~ Polycyclo ring system having the hetero ring as one of the cyclos {2}
434  DF  .~.~.~.~.~.~ Bicyclo ring system having the hetero ring as one of the cyclos {6}
435.~.~.~.~.~.~.~ Plural hetero rings

DEFINITION

Classification: 549/435

(under subclass 434) Compounds wherein at least two hetero

rings are present.

(1) Note. The compounds provided for herein include those wherein both rings of the bicyclo ring system are hetero, as well as those wherein one hetero ring is part of the bicyclo ring system and the other hetero ring may be monocyclic or part of a different bicyclo ring system.

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