US PATENT SUBCLASS 540 / 13
.~.~.~.~.~.~ Nitrogen, sulfur, cyano or -C(=X)-, wherein X is chalcogen, bonded directly to the cyclopentanohydrophenanthrene ring system

Current as of: June, 1999
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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}
7  DF  .~.~.~.~ Plural spiro atoms {4}
12  DF  .~.~.~.~.~ Plural oxygens in both rings which share a spiro atom (e.g., 17,20;20,21 bismethylenedioxy-pregnanes, etc.) {2}
13.~.~.~.~.~.~ Nitrogen, sulfur, cyano or -C(=X)-, wherein X is chalcogen, bonded directly to the cyclopentanohydrophenanthrene ring system

DEFINITION

Classification: 540/13

(under subclass 12) Compounds in which nitrogen, sulfur, cyano or -C(=X)-, wherein X is chalcogen (i.e, oxygen, sulfur, selenium or tellurium), is bonded directly to the cyclopentanohydrophenanthrene ring system.

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