US PATENT SUBCLASS 544 / 184
.~.~.~.~.~.~ Four or more ring hetero atoms in the polycyclo ring system

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}
182  DF  .~.~.~.~ Asymmetrical (e.g., 1, 2, 4-triazines, etc.) {1}
183  DF  .~.~.~.~.~ Polycyclo ring system having the asymmetrical triazine ring as one of the cyclos {1}
184.~.~.~.~.~.~ Four or more ring hetero atoms in the polycyclo ring system

DEFINITION

Classification: 544/184

(under subclass 183) Compounds wherein the polycyclo ring system contains a ring hetero atom in addition to the three ring nitrogens in the six-membered hetero ring.

(1) Note. Two examples of compounds provided for in this subclass are: [figure] [figure]