US PATENT SUBCLASS 544 / 252
.~.~.~.~.~.~.~ Ring nitrogen is shared by two 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}
242  DF  .~.~.~.~ 1,3-diazines {10}
245  DF  .~.~.~.~.~ Polycyclo ring system having the diazine ring as one of the cyclos {3}
249  DF  .~.~.~.~.~.~ Tricyclo ring system having the diazine ring as one of the cyclos {2}
252.~.~.~.~.~.~.~ Ring nitrogen is shared by two of the cyclos

DEFINITION

Classification: 544/252

Ring nitrogen is shared by two of the cyclos:

(under subclass 249) Compounds in which a ring nitrogen is a member of two of the rings in the tricyclo ring system.

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