US PATENT SUBCLASS 552 / 581
.~.~.~.~.~ Unsaturation between the 4- and 5-positions (e.g., 21-thiol prednisones, 21 thio cortisones, etc.)

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}
581.~.~.~.~.~ Unsaturation between the 4- and 5-positions (e.g., 21-thiol prednisones, 21 thio cortisones, etc.)

DEFINITION

Classification: 552/581

(under subclass 569) Compounds which contain a double bond between the 4-and 5-positions of the cyclopentanohydrophenanthrene ring system.

(1) Note. Examples of compounds provided for herein are: [figure]