US PATENT SUBCLASS 548 / 303.4
.~.~.~.~.~.~.~ Four ring nitrogens in the bicyclo ring system (e.g., glycolurile, 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}
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}
300.1  DF  .~.~.~ 1,3-diazoles (including hydrogenated) {9}
301.7  DF  .~.~.~.~ Polycyclo ring system having the diazole ring as one the cyclos {2}
302.7  DF  .~.~.~.~.~ Bicyclo ring system having the diazole ring as one of the cyclos {2}
303.1  DF  .~.~.~.~.~.~ At least three ring hetero atoms in the bicyclo ring system (e.g., furo- imidazole, (1,2-a) imidazole, pyrazo (1,2-a) imidazolidine, etc.) {2}
303.4.~.~.~.~.~.~.~ Four ring nitrogens in the bicyclo ring system (e.g., glycolurile, etc.)


DEFINITION

Classification: 548/303.4

(under subclass 303.1) Compounds in which the bicyclo ring system contains two ring nitrogens in addition to the two ring nitrogens of the diazole ring.

(1) Note. This subclass contains, for example: [figure]