US PATENT SUBCLASS 540 / 520
.~.~.~.~.~ 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.)


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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}
485  DF  .~.~.~ Chalcogen double bonded directly to a ring carbon adjacent to the ring nitrogen (e.g., caprolactam, etc.) {15}
519  DF  .~.~.~.~ Polycyclo ring system which contains the hetero ring as one of the cyclos {4}
520.~.~.~.~.~ 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.)


DEFINITION

Classification: 540/520

(under subclass 519) Compounds wherein (a) at least three members of one cyclone are members of an additional cyclone in the polycyclo ring system or (b) one ring member is a member of three of the cyclos in the polycyclo ring system (e.g., bridged, peri-fused, etc.).

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