US PATENT SUBCLASS 552 / 631
.~.~.~.~.~ The 17 alpha-position substituent contains acyclic carbon-to-carbon unsaturation

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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}
623  DF  .~.~ Two oxygens bonded directly to the cyclopentanohydrophenanthrene ring system {5}
625  DF  .~.~.~ The A ring is a benzene ring (e.g., estrones, estradiols, etc.) {5}
630  DF  .~.~.~.~ 17 alpha-position substituted {1}
631.~.~.~.~.~ The 17 alpha-position substituent contains acyclic carbon-to-carbon unsaturation

DEFINITION

Classification: 552/631

(under subclass 630) Compounds in which the substituent bonded directly at the 17 alpha-position contains acyclic carbon-to-carbon unsaturation.

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