US PATENT SUBCLASS 546 / 66
.~.~.~.~.~.~ Ring carbon is shared by three of the cyclos

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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}
66.~.~.~.~.~.~ Ring carbon is shared by three of the cyclos {1}
67  DF  .~.~.~.~.~.~.~> The three cyclos consist of two carbocyclic rings and a five-membered hetero ring which includes a ring nitrogen (e.g., ergolines, etc.) {2}

DEFINITION

Classification: 546/66

Ring carbon is shared by three of the cyclos:

(under subclass 62) Compounds wherein one ring carbon is a member of three of the cyclos in the tetracyclo ring system (i.e., peri-fusion).

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