US PATENT SUBCLASS 552 / 556
.~.~.~.~ And oxygen bonded directly at the 20-position of the compound

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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}
553  DF  .~.~ Carbon bonded directly at the 17 beta-position of the cyclopentanohydrophenanthrene ring system is a member of an acyclic chain of three or four uninterruped carbons, (e.g., diketobisnorcholenic acids, etc.) {2}
555  DF  .~.~.~ Exactly one oxygen bonded directly to the cyclopentanohydrophenanthrene ring system (e.g., 3-keto-bisnorcholenic acids, 3-keto-bisnor-cholene-22 als, etc.) {1}
556.~.~.~.~ And oxygen bonded directly at the 20-position of the compound

DEFINITION

Classification: 552/556

(under subclass 555) Compounds wherein oxygen is bonded directly to the carbon at the 20-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]