US PATENT SUBCLASS 552 / 620
.~.~.~.~ Carbon or halogen bonded directly at the 1, 2- or 4-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}
612  DF  .~.~ Three or more oxygens bonded directly to the cyclopentanohydrophenanthrene ring system {6}
619  DF  .~.~.~ Oxygen bonded directly at the 3-, 11- and 17-positions (e.g., 1-androstene 3,11,17-triones, etc.) {2}
620.~.~.~.~ Carbon or halogen bonded directly at the 1, 2- or 4-position

DEFINITION

Classification: 552/620

(under subclass 619) Compounds wherein carbon or halogen is bonded directly at the 1-,2-, or 4-position of the cyclopentanohydrophenanthrene ring system.