US PATENT SUBCLASS 552 / 528
.~.~.~ The carbon is double bonded directly at the 16-position

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}
526  DF  .~.~ Carbon double bonded directly to the cyclopentanohydrophenantrene ring system {3}
528.~.~.~ The carbon is double bonded directly at the 16-position {1}
529  DF  .~.~.~.~> And carbon bonded directly at the 17 beta-position is a member of an acyclic chain of two or more uninterrupted carbons

DEFINITION

Classification: 552/528

(under subclass 526) Compounds wherein the carbon is double bonded directly at the 16-position of the cyclopentanohydrophenanthrene ring system.