US PATENT SUBCLASS 546 / 64
.~.~.~.~.~.~ Three or more ring hetero atoms in the tetracyclo ring system

Current as of: June, 1999
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546 /   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 consisting of one nitrogen and five carbons {24}
26  DF  .~.~.~ Polycyclo ring system having the six-membered hetero ring as one of the cyclos {9}
61  DF  .~.~.~.~ Tetracyclo ring system having the six-membered hetero ring as one of the cyclos {5}
62  DF  .~.~.~.~.~ Plural ring hetero atoms in the tetracyclo ring system (e.g., acronycines, etc.) {4}
64.~.~.~.~.~.~ Three or more ring hetero atoms in the tetracyclo ring system {1}
65  DF  .~.~.~.~.~.~.~> Plural ring chalcogens in the tetracyclo ring system

DEFINITION

Classification: 546/64

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

(under subclass 62) Compounds wherein the tetracyclo ring system contains at least two ring hetero atoms in addition to the ring nitrogen of the six-membered hetero ring.

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