US PATENT SUBCLASS 552 / 624
.~.~.~ Oxygen 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}
623  DF  .~.~ Two oxygens bonded directly to the cyclopentanohydrophenanthrene ring system {5}
624.~.~.~ Oxygen bonded directly at the 16-position

DEFINITION

Classification: 552/624

(under subclass 623) Compounds wherein oxygen is bonded directly at the 16-position of the cyclopentanohydrophenanthrene ring system.