US PATENT SUBCLASS 540 / 11
.~.~.~.~.~ The cyclopentanohydrophenanthrene ring system shares a spiro atom with a lactone ring (i.e., -C(=X)-O- is part of the ring, wherein X is chalcogen)

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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}
11.~.~.~.~.~ The cyclopentanohydrophenanthrene ring system shares a spiro atom with a lactone ring (i.e., -C(=X)-O- is part of the ring, wherein X is chalcogen)

DEFINITION

Classification: 540/11

(under subclass 7) Compounds in which the cyclopentanohydrophenanthrene ring system shares a spiro atom with a lactone ring; i.e., - - O -, wherein X is chalcogen (i.e., oxygen, sulfur, selenium or tellurium), and is part of the ring.

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