US PATENT SUBCLASS 552 / 628
.~.~.~.~ Carbon or halogen bonded directly at the 6- or 7-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}
625  DF  .~.~.~ The A ring is a benzene ring (e.g., estrones, estradiols, etc.) {5}
628.~.~.~.~ Carbon or halogen bonded directly at the 6- or 7-position

DEFINITION

Classification: 552/628

(under subclass 625) Compounds wherein carbon or halogen is bonded directly at the 6- or 7-position of the cyclopentanohydrophenanthrene ring system.