US PATENT SUBCLASS 552 / 642
.~.~.~ Carbon bonded directly at the 13-position (e.g., 19-norandrostenes, estradienes, etc.)


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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}
642.~.~.~ Carbon bonded directly at the 13-position (e.g., 19-norandrostenes, estradienes, etc.) {4}
643  DF  .~.~.~.~> Carbon or halogen bonded directly at the 1-, 2-, 4- or 5-position
644  DF  .~.~.~.~> Unsaturation between the 5- and 10-positions {1}
646  DF  .~.~.~.~> Unsaturation between the 4- and 5-positions (e.g., 19-nortestosterones, 13 beta-alkyl-4-gonene-3,17-diones etc.) {2}
649  DF  .~.~.~.~> The cyclopentanohydrophenanthrene ring system is fully saturated (e.g., 17 alpha-alkyl-17 beta-hydroxyestran-3-ones, etc.)


DEFINITION

Classification: 552/642

(under subclass 623) Compounds wherein carbon is bonded directly at the 13-position of the cyclopentanohydrophenanthrene ring system.

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