US PATENT SUBCLASS 552 / 576
.~.~.~.~.~.~ Unsaturation between the 1- and 2-positions and the 4- and 5-positions (e.g., prednisones, prednisolones, 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}
570  DF  .~.~.~.~.~ Oxygen bonded directly at the 21-position {7}
576.~.~.~.~.~.~ Unsaturation between the 1- and 2-positions and the 4- and 5-positions (e.g., prednisones, prednisolones, etc.)

DEFINITION

Classification: 552/576

(under subclass 570) Compounds which contain double bonds between the 1,2-positions and the 4,5-positions of the cyclopentanohydrophenanthrene ring system.

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