US PATENT SUBCLASS 552 / 623
.~.~ Two oxygens bonded directly to the cyclopentanohydrophenanthrene ring system


Current as of: June, 1999
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552 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {11}
502  DF  .~ Cyclopentanohydrophenanthrene ring system containing {21}
623.~.~ Two oxygens bonded directly to the cyclopentanohydrophenanthrene ring system {5}
624  DF  .~.~.~> Oxygen bonded directly at the 16-position
625  DF  .~.~.~> The A ring is a benzene ring (e.g., estrones, estradiols, etc.) {5}
632  DF  .~.~.~> 19-position substituted (e.g., 19-methylene-androstanes, 10-cyanoestranes, etc.)
633  DF  .~.~.~> Carbon bonded directly at the 10- and 13-positions (e.g., androstenes, etc.) {5}
642  DF  .~.~.~> Carbon bonded directly at the 13-position (e.g., 19-norandrostenes, estradienes, etc.) {4}


DEFINITION

Classification: 552/623

(under subclass 502) Compounds wherein two oxygens are bonded directly to the cyclopentanohydrophenanthrene ring system.

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

[figure]