US PATENT SUBCLASS 540 / 471
.~.~.~.~ Polycyclo ring system which contains the hetero ring as one of the cyclos


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}
450  DF  .~.~ The hetero ring contains at least eight members including nitrogen and carbon {9}
470  DF  .~.~.~ The hetero ring contains plural nitrogens {2}
471.~.~.~.~ Polycyclo ring system which contains the hetero ring as one of the cyclos {2}
472  DF  .~.~.~.~.~> Two of the cyclos share at least three ring members or a ring member is shared by three of the cyclos (e.g., bridged, peri-fused, etc., toxiferin)
473  DF  .~.~.~.~.~> Bicyclo ring system which contains the hetero ring as one of the cyclos


DEFINITION

Classification: 540/471

(under subclass 470) Compounds in which the hetero ring is one of the cyclos of a polycyclo ring system.

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