US PATENT SUBCLASS 548 / 126
.~.~.~.~ Polycyclo ring system having the five-membered hetero ring 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}
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}
125  DF  .~.~.~ The five-membered hetero ring consists of chalcogen, plural nitrogens, and carbon {7}
126.~.~.~.~ Polycyclo ring system having the five-membered hetero ring as one of the cyclos


DEFINITION

Classification: 548/126

(under subclass 125) Compounds wherein the five-membered hetero ring is one of the cyclos of a polycyclo ring system.

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