US PATENT SUBCLASS 540 / 10
.~.~.~.~.~ The cyclopentanohydrophenanthrene ring system shares spiro atoms with two hetero rings, each of which contains two oxygens (e.g., 3,17-bis-ketals, etc.)

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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}
10.~.~.~.~.~ The cyclopentanohydrophenanthrene ring system shares spiro atoms with two hetero rings, each of which contains two oxygens (e.g., 3,17-bis-ketals, etc.)

DEFINITION

Classification: 540/10

(under subclass 7) Compounds in which the cyclopentanohydrophenanthrene ring system shares spiro atoms with two hetero rings, each of which contains two oxygens.

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