US PATENT SUBCLASS 552 / 593
.~.~.~.~.~ Oxygen bonded directly at the 21-position


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}
557  DF  .~.~ Carbon bonded directly at the 17-beta-position of the cyclopentanohydrophenanthrene ring system is a member of an acyclic chain of two uninterrupted carbons (e.g., pregnanes, etc.) {4}
582  DF  .~.~.~ Two oxygens bonded directly to the cyclopentanohydrophenanthrene ring system {5}
592  DF  .~.~.~.~ Oxygen bonded directly at the 3- and 17-positions {4}
593.~.~.~.~.~ Oxygen bonded directly at the 21-position {2}
594  DF  .~.~.~.~.~.~> Carbon or halogen bonded directly at the 6- or 7-position
595  DF  .~.~.~.~.~.~> Unsaturation between the 4- and 5-positions (e.g., 17-alpha-hydroxy progesterones, etc.)


DEFINITION

Classification: 552/593

(under subclass 592) Compounds wherein oxygen is bonded directly to the carbon at the 21-position of the acyclic carbon chain that is bonded directly at the 17-position of the cyclopentanohydrophenanthrene ring system.

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