US PATENT SUBCLASS 548 / 120
.~.~.~ The five-membered hetero ring contains ring selenium and is one of the cyclos in a polycyclo ring system

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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}
100  DF  .~.~ Hetero ring is five-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazoles, etc.) {18}
120.~.~.~ The five-membered hetero ring contains ring selenium and is one of the cyclos in a polycyclo ring system {1}
121  DF  .~.~.~.~> Bicyclo ring system having the five-membered hetero ring as one of the cyclos

DEFINITION

Classification: 548/120

(under subclass 100) Compounds wherein the five-membered hetero ring contains ring selenium as an additional hetero atom and is one of the cylcos in a polycyclo ring system.

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