US PATENT SUBCLASS 552 / 566
.~.~.~.~.~ Oxygen bonded directly at the 21-position (e.g., triamcinolone, etc.)

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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}
564  DF  .~.~.~.~ Oxygen bonded directly at the 16-position {2}
566.~.~.~.~.~ Oxygen bonded directly at the 21-position (e.g., triamcinolone, etc.)

DEFINITION

Classification: 552/566

(under subclass 564) 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]