US PATENT SUBCLASS 552 / 553
.~.~ 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.)

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}
553.~.~ 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}
554  DF  .~.~.~> Halogen or nitrogen containing (e.g., 20-cyano-pregnanes, 21-cyano pregnenes, etc.)
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}

DEFINITION

Classification: 552/553

(under subclass 502) Compounds wherein carbon bonded directly at the 17 beta-position of the cyclopentanohydrophenanthrene ring system is a member of an acyclic chain of three or four uninterrupted carbons.

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