US PATENT SUBCLASS 540 / 43
.~.~.~.~.~.~ Chalcogen bonded directly at the 11-position of the cyclopentanohydrophenanthrene ring system

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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}
2  DF  .~.~ Cyclopentanohydrophenanthrene ring system containing {10}
6  DF  .~.~.~ Spiro {3}
28  DF  .~.~.~.~ The spiro includes the cyclopentanohydrophenanthrene ring system and a hetero ring {6}
41  DF  .~.~.~.~.~ The spiro hetero ring contains -C(=X)-O-, wherein X is chalcogen, as part of the ring (e.g., spiro-lactones, etc.) {3}
43.~.~.~.~.~.~ Chalcogen bonded directly at the 11-position of the cyclopentanohydrophenanthrene ring system

DEFINITION

Classification: 540/43

(under subclass 41) Compounds in which chalcogen (i.e., oxygen, sulfur selenium or tellurium) is bonded directly at the 11-position of the cyclopentanohydrophenanthrene ring system.

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