US PATENT SUBCLASS 540 / 12
.~.~.~.~.~ Plural oxygens in both rings which share a spiro atom (e.g., 17,20;20,21 bismethylenedioxy-pregnanes, etc.)

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.~.~.~.~.~ Plural oxygens in both rings which share a spiro atom (e.g., 17,20;20,21 bismethylenedioxy-pregnanes, etc.) {2}
13  DF  .~.~.~.~.~.~> Nitrogen, sulfur, cyano or -C(=X)-, wherein X is chalcogen, bonded directly to the cyclopentanohydrophenanthrene ring system
14  DF  .~.~.~.~.~.~> Halogen attached directly or indirectly to the cyclopentanohydrophenanthrene ring system by acyclic nonionic bonding

DEFINITION

Classification: 540/12

(under subclass 7) Compounds wherein both rings which share a spiro atom contain at least two oxygens.

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