US PATENT SUBCLASS 540 / 110
.~.~.~.~.~ The hetero ring is bonded directly to a -C(=X)- group, wherein X is chalcogen

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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}
107  DF  .~.~.~ Nitrogen containing hetero ring attached indirectly to the cyclopentanohydrophenanthrene ring system by nonionic bonding {3}
109  DF  .~.~.~.~ The hetero ring is in the 17-position substituent of the cyclopentanohydrophenanthrene ring system {3}
110.~.~.~.~.~ The hetero ring is bonded directly to a -C(=X)- group, wherein X is chalcogen

DEFINITION

Classification: 540/110

(under subclass 108) Compounds in which thehetero ring is bonded directly to a - C - group, wherein X is chalcogen (i.e., oxygen, sulfur, selenium or tellurium).

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