US PATENT SUBCLASS 552 / 640
.~.~.~.~.~ Additional unsaturation in the cyclopentanohydrophenanthrene ring system

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}
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}
638  DF  .~.~.~.~ Unsaturation between the 4- and 5-positions (e.g., testosterones, etc.) {2}
640.~.~.~.~.~ Additional unsaturation in the cyclopentanohydrophenanthrene ring system

DEFINITION

Classification: 552/640

(under subclass 638) Compounds which contain an additional double bond between ring members of the cyclopentanohydrophenanthrene ring system.