US PATENT SUBCLASS 552 / 617
.~.~.~.~ The A ring is a benzene ring (e.g., estriols, etc.)

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}
612  DF  .~.~ Three or more oxygens bonded directly to the cyclopentanohydrophenanthrene ring system {6}
616  DF  .~.~.~ Oxygen bonded directly at the 16-position {1}
617.~.~.~.~ The A ring is a benzene ring (e.g., estriols, etc.)

DEFINITION

Classification: 552/617

(under subclass 616) Compounds in which the A ring of the cyclopentanohydrophenanthrene ring system contains three alternating double bonds (i.e., is a benzene ring).

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