US PATENT SUBCLASS 548 / 419
.~.~.~.~.~ Two of the cyclos share at least three ring members, or a ring carbon is shared by three of the cyclos (e.g., bridged, peri-fused, etc.)

Current as of: June, 1999
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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}
416  DF  .~.~.~ Polycyclo ring system having the five-membered hetero ring as one of the cyclos {5}
418  DF  .~.~.~.~ Pentacyclo ring system having the five-membered hetero ring as one of the cyclos {1}
419.~.~.~.~.~ Two of the cyclos share at least three ring members, or a ring carbon is shared by three of the cyclos (e.g., bridged, peri-fused, etc.)

DEFINITION

Classification: 548/419

(under subclass 418) Compounds wherein at least three ring members of one cyclo are ring members of an additional cyclo in the pentacyclo ring system, or wherein one ring carbon is a member of three of the cyclos in the pentacyclo system.

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