US PATENT SUBCLASS 552 / 570
.~.~.~.~.~ 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}
559  DF  .~.~.~ Three or more oxygens bonded directly to the cyclopentanohydrophenanthrene ring system {7}
569  DF  .~.~.~.~ Oxygen bonded directly at the 3-, 11-, and 17-positions {3}
570.~.~.~.~.~ Oxygen bonded directly at the 21-position {7}
571  DF  .~.~.~.~.~.~> Carbon bonded directly at the 1-, 2- or 4-position
572  DF  .~.~.~.~.~.~> Carbon or halogen bonded directly at the 6- or 7-position {1}
574  DF  .~.~.~.~.~.~> Carbon bonded directly at the 16-position (e.g., betamethasones, dexamethasones, etc.)
575  DF  .~.~.~.~.~.~> Nitrogen or sulfur containing
576  DF  .~.~.~.~.~.~> Unsaturation between the 1- and 2-positions and the 4- and 5-positions (e.g., prednisones, prednisolones, etc.)
577  DF  .~.~.~.~.~.~> Unsaturation between the 4- and 5-positions (e.g., cortisones, etc.) {1}
579  DF  .~.~.~.~.~.~> The cyclopentanohydrophenanthrene ring system is fully saturated


DEFINITION

Classification: 552/570

(under subclass 569) Compounds in which 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]