US PATENT SUBCLASS 540 / 113
.~.~.~.~ Chalcogen in chain between the hetero ring and 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}
107  DF  .~.~.~ Nitrogen containing hetero ring attached indirectly to the cyclopentanohydrophenanthrene ring system by nonionic bonding {3}
113.~.~.~.~ Chalcogen in chain between the hetero ring and the cyclopentanohydrophenanthrene ring system

DEFINITION

Classification: 540/113

(under subclass 107) Compounds in which chalogen (i.e., oxygen, sulfur, selenium or tellurium) is in the chain between the hetero ring and the cyclopentanohydrophenanthrene ring system.

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