US PATENT SUBCLASS 544 / 345
.~.~.~.~.~.~.~ Three or more ring hetero atoms in the tricyclo 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}
224  DF  .~.~.~ The six-membered hetero ring consists of two nitrogens and four carbons (e.g., 1,2-diazines, etc.) {9}
336  DF  .~.~.~.~ 1,4-diazines {9}
338  DF  .~.~.~.~.~ Polycyclo ring system having the diazine ring as one of the cyclos {5}
344  DF  .~.~.~.~.~.~ Tricyclo ring system having the diazine ring as one of the cyclos {2}
345.~.~.~.~.~.~.~ Three or more ring hetero atoms in the tricyclo ring system {1}
346  DF  .~.~.~.~.~.~.~>.~ Ring nitrogen is shared by two of the cyclos (e.g., ergot, alkaloids, etc.)

DEFINITION

Classification: 544/345

Three or more ring hetero atoms in the tricyclo ring system:

(under subclass 344) Compounds wherein the tricyclo ring system includes at least one ring hetero atom in addition to the two ring nitrogens of the six-membered hetero ring.