US PATENT SUBCLASS 546 / 90
.~.~.~.~.~.~.~ Plural ring oxygens in the tricyclo ring system


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546 /   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) {1}
1  DF  .~.~ Hetero ring is six-membered consisting of one nitrogen and five carbons {24}
26  DF  .~.~.~ Polycyclo ring system having the six-membered hetero ring as one of the cyclos {9}
79  DF  .~.~.~.~ Tricyclo ring system having the six-membered hetero ring as one of the cyclos {7}
80  DF  .~.~.~.~.~ Plural ring hetero atoms in the tricyclo ring system {2}
89  DF  .~.~.~.~.~.~ Ring oxygen in the tricyclo ring system {3}
90.~.~.~.~.~.~.~ Plural ring oxygens in the tricyclo ring system


DEFINITION

Classification: 546/90

Plural ring oxygens in the tricyclo ring system:

(under subclass 89) Compounds in which the tricyclo ring system contains at least two ring oxygens.

(1) Note. An example of a compound provided for here is: [figure]