US PATENT SUBCLASS 540 / 118
.~.~.~.~ The hetero ring is bonded directly to chalcogen which is bonded directly to 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}
114  DF  .~.~.~ Oxygen containing hetero ring attached indirectly to the cyclopentanohydrophenanthrene ring system by nonionic bonding {4}
118.~.~.~.~ The hetero ring is bonded directly to chalcogen which is bonded directly to the cyclopentanohydrophenanthrene ring system {1}
119  DF  .~.~.~.~.~> The chalcogen is bonded directly at the 17-position of the cyclopentanohydrophenanthrene ring system

DEFINITION

Classification: 540/118

(under subclass 114) Compounds wherein the hetero ring is bonded directly to chalcogen (i.e., oxygen, sulfur, selenium or tellurium), which chalcogen is also bonded directly to the cyclopentanohydrophenanthrene ring system.

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