US PATENT SUBCLASS 548 / 411
.~.~.~.~.~ Polycyclo ring system having one of the two rings which form the spiro as one of the cyclos

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548 /   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) {4}
400  DF  .~.~ Hetero ring is five-membered consisting of one nitrogen and four carbons (e.g., halopyrrolidines, etc.) {20}
407  DF  .~.~.~ Spiro {1}
408  DF  .~.~.~.~ The spiro includes the five-membered hetero ring {2}
411.~.~.~.~.~ Polycyclo ring system having one of the two rings which form the spiro as one of the cyclos

DEFINITION

Classification: 548/411

(under subclass 408) Compounds wherein one of the two rings which form the spiro ring system is additionally one of the cyclos of a polycyclo ring system.

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