US PATENT SUBCLASS 552 / 636
.~.~.~.~ Unsaturation between the 5- and 6-positions (e.g., dehydroandrosterones, 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}
633  DF  .~.~.~ Carbon bonded directly at the 10- and 13-positions (e.g., androstenes, etc.) {5}
636.~.~.~.~ Unsaturation between the 5- and 6-positions (e.g., dehydroandrosterones, etc.) {1}
637  DF  .~.~.~.~.~> 17 alpha-position substituted (e.g., 17 alpha-ethynyl-5-androstene-3 beta, 17 beta-diols, etc.)

DEFINITION

Classification: 552/636

(under subclass 633) Compounds which contain a double bond between the 5- and 6-positions of the cyclopentanohydrophenanthrene ring system.

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