US PATENT SUBCLASS 544 / 248
.~.~.~.~.~.~.~ Ring carbon is shared by three of the cyclos (e.g., anthrapyrimidine, etc.)

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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}
246  DF  .~.~.~.~.~.~ Tetracyclo ring system having the diazine ring as one of the cyclos {2}
248.~.~.~.~.~.~.~ Ring carbon is shared by three of the cyclos (e.g., anthrapyrimidine, etc.)

DEFINITION

Classification: 544/248

Ring carbon is shared by three of the cyclos (e.g., anthrapyrimidine, etc.):

(under subclass 246) Compounds wherein three of the cyclos of the tetracyclo ring system have a ring carbon which is common to each of them.

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