US PATENT SUBCLASS 540 / 84
.~.~.~.~.~.~ The hetero ring shares the 16,17-positions of the cyclopentanohydrophenanthrene ring system

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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}
76  DF  .~.~.~.~.~ The hetero ring is three-membered consisting of one oxygen and two carbons (e.g., oxirane, etc.) {9}
84.~.~.~.~.~.~ The hetero ring shares the 16,17-positions of the cyclopentanohydrophenanthrene ring system {2}
85  DF  .~.~.~.~.~.~.~> Halogen bonded directly to the cyclopentanohydrophenanthrene ring system
86  DF  .~.~.~.~.~.~.~> Saturated A ring

DEFINITION

Classification: 540/84

(under subclass 76) Compounds in which the hetero ring is ortho-fused to the D ring of the cyclopentanohydrophenanthrene ring system at the 16, 17-positions.

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