US PATENT SUBCLASS 544 / 209
.~.~.~.~.~.~.~ Hetero ring

Current as of: June, 1999
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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}
180  DF  .~.~.~ Triazines {11}
194  DF  .~.~.~.~ Substituent nitrogen bonded directly to carbon of the triazine ring {5}
204  DF  .~.~.~.~.~ Two substituent nitrogens bonded directly to two carbons of the triazine ring {3}
208  DF  .~.~.~.~.~.~ Additional ring containing {1}
209.~.~.~.~.~.~.~ Hetero ring

DEFINITION

Classification: 544/209

(under subclass 208) Compounds wherein the additional ring is a hetero ring.

(1) Note. The additional hetero ring may be another triazine ring.

(2) Note. There must be at least four ring hetero atoms in the molecule to be classified here.