US PATENT SUBCLASS 540 / 459
.~.~.~.~.~.~.~.~.~ Nitrogen, sulfur or halogen attached directly to the tetracyclo ring system by nonionic bonding


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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}
451  DF  .~.~.~ Chalcogen double bonded directly to a ring carbon of the hetero ring which is adjacent to the ring nitrogen (e.g., laurolactam, etc.) {7}
454  DF  .~.~.~.~ Chalcogen in the hetero ring {1}
455  DF  .~.~.~.~.~ Polycyclo ring system which contains the hetero ring as one of the cyclos {1}
456  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.) {1}
457  DF  .~.~.~.~.~.~.~ A five-membered cyclo of the polycyclo ring system consists of four ring carbons and one ring oxygen (e.g., fused rifamycins, etc.) {1}
458  DF  .~.~.~.~.~.~.~.~ Tetracyclo ring system which contains the hetero ring as one of the cyclos (e.g., rifamycin S, etc.) {1}
459.~.~.~.~.~.~.~.~.~ Nitrogen, sulfur or halogen attached directly to the tetracyclo ring system by nonionic bonding


DEFINITION

Classification: 540/459

(under subclass 458) Compounds in which nitrogen, sulfur or halogen is attached directly to the tetracyclo ring system by nonionic bonding.

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