US PATENT SUBCLASS 552 / 541
.~.~.~ Oxygen 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}
540  DF  .~.~ Carbon bonded directly at the 17 beta-position of the cyclopentanohydrophenanthrene ring system is a member of an acyclic chain of six or more uninterrupted carbons (e.g., sterols, etc.) {4}
541.~.~.~ Oxygen bonded directly at the 1-, 2-, or 4-position

DEFINITION

Classification: 552/541

(under subclass 540) Compounds wherein oxygen is bonded directly at the 1-, 2-, or 4-position of the cyclopentanohydrophenanthrene ring system.

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