US PATENT SUBCLASS 540 / 91
.~.~.~.~.~.~ Bridge consisting of oxygen and carbon between the 6- and 10-positions of the cyclopentanohydrophenanthrene ring system (e.g., 6,19-oxido steroids, etc.)

Current as of: June, 1999
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540 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS {6}
2  DF  .~.~ Cyclopentanohydrophenanthrene ring system containing {10}
47  DF  .~.~.~ The cyclopentanohydrophenanthrene ring system is part of a polycyclo ring system having at least five cyclos {1}
48  DF  .~.~.~.~ Hetero ring is one of the cyclos of the polycyclo ring system {8}
90  DF  .~.~.~.~.~ The hetero ring shares at least three ring members with one other cyclo of the polycyclo ring system (i.e., bridged) {2}
91.~.~.~.~.~.~ Bridge consisting of oxygen and carbon between the 6- and 10-positions of the cyclopentanohydrophenanthrene ring system (e.g., 6,19-oxido steroids, etc.)

DEFINITION

Classification: 540/91

(under subclass 90) Compounds wherein the bridge consists of oxygen and carbon and links the 6 - and 10-positions of the cyclopentanohydrophenanthrene ring system.

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