US PATENT SUBCLASS 548 / 464
.~.~.~.~.~.~ Ring carbon of the five-membered hetero ring is bonded directly to a ring carbon of the hetero ring which is a cyclo in the additional polycyclo heterocyclic ring system (e.g., indigoid dyes, etc.)

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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}
452  DF  .~.~.~.~ Bicyclo ring system having the five-membered hetero ring as one of the cyclos (e.g., octahydroindoles, etc.) {7}
454  DF  .~.~.~.~.~ Additional polycyclo heterocyclic ring system attached directly or indirectly to the bicyclo ring system by nonionic bonding {3}
464.~.~.~.~.~.~ Ring carbon of the five-membered hetero ring is bonded directly to a ring carbon of the hetero ring which is a cyclo in the additional polycyclo heterocyclic ring system (e.g., indigoid dyes, etc.)

DEFINITION

Classification: 548/464

(under subclass 454) Compounds wherein a ring carbon of the hetero ring which is a cyclo in the additional polycyclo heterocyclic ring system is bonded directly to a ring carbon of the five-membered hetero ring.

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