US PATENT SUBCLASS 548 / 427
.~.~.~.~ Tricyclo ring system having the five-membered hetero ring as one of the cyclos


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}
427.~.~.~.~ Tricyclo ring system having the five-membered hetero ring as one of the cyclos {6}
428  DF  .~.~.~.~.~> Ring nitrogen is shared by two of the cyclos
429  DF  .~.~.~.~.~> Plural ring hetero atoms in the tricyclo ring system {2}
434  DF  .~.~.~.~.~> Two of the cyclos share at least three ring members (i.e., bridged) {1}
436  DF  .~.~.~.~.~> A ring carbon is shared by three of the cyclos (e.g., peri-fused, etc.) {2}
439  DF  .~.~.~.~.~> The five-membered hetero ring shares ring carbons with two carbocyclic rings (e.g., tetrahydrocarbazoles, etc.) {3}
450  DF  .~.~.~.~.~> Chalcogen bonded directly to ring carbon of the five-membered hetero ring (e.g., indigoid dyes, etc.) {1}


DEFINITION

Classification: 548/427

(under subclass 416) Compounds wherein the polycyclo ring system consists of exactly three cyclos.