US PATENT SUBCLASS 548 / 181
.~.~.~.~ Polycyclo heterocyclic ring system containing ring nitrogen

Current as of: June, 1999
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548 /   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) {4}
100  DF  .~.~ Hetero ring is five-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazoles, etc.) {18}
146  DF  .~.~.~ 1,3-thiazoles (including hydrogenated) {7}
181.~.~.~.~ Polycyclo heterocyclic ring system containing ring nitrogen

DEFINITION

Classification: 548/181

(under subclass 146) Compounds containing a polycyclo heterocyclic ring system which has nitrogen as a ring hetero atom.

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