US PATENT SUBCLASS 540 / 7
.~.~.~.~ Plural spiro atoms


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.~.~.~.~ Plural spiro atoms {4}
8  DF  .~.~.~.~.~> The cyclopentanohydrophenanthrene ring system is part of a polycyclo ring system having at least five cyclos {1}
10  DF  .~.~.~.~.~> The cyclopentanohydrophenanthrene ring system shares spiro atoms with two hetero rings, each of which contains two oxygens (e.g., 3,17-bis-ketals, etc.)
11  DF  .~.~.~.~.~> 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)
12  DF  .~.~.~.~.~> Plural oxygens in both rings which share a spiro atom (e.g., 17,20;20,21 bismethylenedioxy-pregnanes, etc.) {2}


DEFINITION

Classification: 540/7

(under subclass 6) Compounds which contain at least two discrete spiro atoms.

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

[figure]