US PATENT SUBCLASS 552 / 643
.~.~.~.~ Carbon or halogen bonded directly at the 1-, 2-, 4- or 5-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}
642  DF  .~.~.~ Carbon bonded directly at the 13-position (e.g., 19-norandrostenes, estradienes, etc.) {4}
643.~.~.~.~ Carbon or halogen bonded directly at the 1-, 2-, 4- or 5-position

DEFINITION

Classification: 552/643

(under subclass 642) Compounds wherein carbon or halogen is bonded directly at the 1-, 2-, 4-, or 5-position of the cyclopentanohydrophenanthrene ring system.