US PATENT SUBCLASS 540 / 16
.~.~.~.~.~ Hetero ring is one of the cyclos of the polycyclo 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}
6  DF  .~.~.~ Spiro {3}
15  DF  .~.~.~.~ The cyclopentanohydrophenanthrene ring system is part of a polycyclo ring system having at least five cyclos {1}
16.~.~.~.~.~ Hetero ring is one of the cyclos of the polycyclo ring system {5}
17  DF  .~.~.~.~.~.~> The hetero ring is five-membered, consisting of one oxygen and four carbons, and shares the spiro atom with a six-membered oxygen containing hetero ring (e.g., sapogenins, etc.) {4}
23  DF  .~.~.~.~.~.~> The spiro atom is the 17-position carbon of the cyclopentanohydrophenanthrene ring system
24  DF  .~.~.~.~.~.~> The hetero ring shares the 11,12,13-positions of the cyclopentanohydrophenanthrene ring system (i.e., bridged; e.g., 11,18-oxido steroids, etc.)
25  DF  .~.~.~.~.~.~> The hetero ring is three-membered consisting of one oxygen and two carbons (e.g., oxirane, etc.) {1}
27  DF  .~.~.~.~.~.~> The hetero ring contains two chalcogens which are bonded directly at the 16 and 17-positions of the cyclopentanohydrophenanthrene ring system


DEFINITION

Classification: 540/16

(under subclass 15) Compounds in which a hetero ring is one of the cyclos of the polycyclo ring system.

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