US PATENT SUBCLASS 540 / 21
.~.~.~.~.~.~.~.~ Chalcogen bonded directly at the 7-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}
15  DF  .~.~.~.~ The cyclopentanohydrophenanthrene ring system is part of a polycyclo ring system having at least five cyclos {1}
16  DF  .~.~.~.~.~ Hetero ring is one of the cyclos of the polycyclo ring system {5}
17  DF  .~.~.~.~.~.~ The hetero ring is five-membered, consisting of one oxygen and four carbons, and shares the spiro atom with a six-membered oxygen containing hetero ring (e.g., sapogenins, etc.) {4}
20  DF  .~.~.~.~.~.~.~ Chalcogen bonded directly at the 11-position of the cyclopentanohydrophenanthrene ring system {1}
21.~.~.~.~.~.~.~.~ Chalcogen bonded directly at the 7-position of the cyclopentanohydrophenanthrene ring system

DEFINITION

Classification: 540/21

(under subclass 20) Compounds wherein chalcogen (i.e, oxygen, sulfur, selenium or tellurium) is bonded directly at the 7-position of the cyclopentanohydrophenanthrene ring system.

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