US PATENT SUBCLASS 552 / 650
.~.~ Oxygen bonded directly at the 16- or 17-position of the cyclopentanohydrophenanthrene ring system

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}
650.~.~ Oxygen bonded directly at the 16- or 17-position of the cyclopentanohydrophenanthrene ring system {2}
651  DF  .~.~.~> Carbon or halogen bonded directly at the 1- or 3-position
652  DF  .~.~.~> Carbon or halogen bonded directly at the 2-, 4- or 5-position

DEFINITION

Classification: 552/650

(under subclass 502) Compounds wherein oxygen is bonded directly at the 16- or 17-position of the cyclopentanohydrophenanthrene ring system.

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