US PATENT SUBCLASS 544 / 284
.~.~.~.~.~.~.~.~ Additional nitrogen containing unsaturated hetero ring (e.g., thiazole, etc.)

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}
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}
253  DF  .~.~.~.~.~.~ Bicyclo ring system having the diazine ring as one of the cyclos {5}
283  DF  .~.~.~.~.~.~.~ The other cyclo in the bicyclo ring system is a benzene ring (e.g., quinazoline, etc.) {7}
284.~.~.~.~.~.~.~.~ Additional nitrogen containing unsaturated hetero ring (e.g., thiazole, etc.)

DEFINITION

Classification: 544/284

Additional unsaturated hetero ring having at least nitrogen as a ring hetero atom:

(under subclass 283) Compounds having, in addition to the bicyclo ring system, a hetero ring which has at least one double bond between ring members and at least one ring nitrogen.