US PATENT SUBCLASS 544 / 233
.~.~.~.~ Polycyclo ring system having a 1,2-diazine ring as one of the cyclos

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544 /   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) {1}
1  DF  .~.~ Hetero ring is six-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazines, etc.) {6}
224  DF  .~.~.~ The six-membered hetero ring consists of two nitrogens and four carbons (e.g., 1,2-diazines, etc.) {9}
233.~.~.~.~ Polycyclo ring system having a 1,2-diazine ring as one of the cyclos {2}
234  DF  .~.~.~.~.~> Tricyclo ring system having the 1,2-diazine ring as one of the cyclos
235  DF  .~.~.~.~.~> Bicyclo ring system having the 1,2-diazine ring as one of the cyclos {2}

DEFINITION

Classification: 544/233

Polycyclo ring system having a 1,2-diazine ring as one of the cyclos:

(under subclass 224) Compounds wherein the six-membered hetero ring has the two ring nitrogens in the 1- and 2-positions and is a cyclo in a polycyclo ring system.

(1) Note. A diazine ring in a polycyclo ring system is numbered as if it were a single ring and not part of a ring system. Therefore, the diazine ring is considered 1,2-diazine in each of the following: [figure] [figure]