US PATENT SUBCLASS 546 / 18
.~.~.~.~.~.~ Polycyclo ring system having the six-membered hetero ring as one of the cyclos

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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}
15  DF  .~.~.~ Spiro {1}
16  DF  .~.~.~.~ The spiro includes the six-membered hetero ring {2}
17  DF  .~.~.~.~.~ Polycyclo ring system having one of the two rings which form the spiro as one of the cyclos {1}
18.~.~.~.~.~.~ Polycyclo ring system having the six-membered hetero ring as one of the cyclos

DEFINITION

Classification: 546/18

Polycyclo ring system having the six-membered hetero ring as one of the cyclos:

(under subclass 17) Compounds wherein the six-membered hetero ring is one of the cyclos of the polycyclo ring system.

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