US PATENT SUBCLASS 540 / 554
.~.~.~.~ The hetero ring contains at least three nitrogens

Current as of: June, 1999
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540 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS {6}
484  DF  .~.~ The hetero ring contains seven members including nitrogen and carbon {14}
553  DF  .~.~.~ The hetero ring contains plural nitrogens (e.g., 1,3-diazepines, etc.) {3}
554.~.~.~.~ The hetero ring contains at least three nitrogens

DEFINITION

Classification: 540/554

(under subclass 553) Compounds in which the hetero ring contains three or more nitrogens.

(1) Note. Examples of compounds provided for herein are: [figure]