US PATENT SUBCLASS 552 / 625
.~.~.~ The A ring is a benzene ring (e.g., estrones, estradiols, 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}
623  DF  .~.~ Two oxygens bonded directly to the cyclopentanohydrophenanthrene ring system {5}
625.~.~.~ The A ring is a benzene ring (e.g., estrones, estradiols, etc.) {5}
626  DF  .~.~.~.~> Nitrogen or sulfur containing
627  DF  .~.~.~.~> Carbon or halogen bonded directly at the 1-, 2- or 4-position
628  DF  .~.~.~.~> Carbon or halogen bonded directly at the 6- or 7-position
629  DF  .~.~.~.~> Carbon bonded directly at the 11-, 15- or 16-position
630  DF  .~.~.~.~> 17 alpha-position substituted {1}

DEFINITION

Classification: 552/625

(under subclass 623) 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]