US PATENT SUBCLASS 540 / 112
.~.~.~.~.~ Chalcogen or nitrogen 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}
109  DF  .~.~.~.~ The hetero ring is in the 17-position substituent of the cyclopentanohydrophenanthrene ring system {3}
112.~.~.~.~.~ Chalcogen or nitrogen in chain between the hetero ring and the cyclopentanohydrophenanthrene ring system

DEFINITION

Classification: 540/112

(under subclass 109) Compounds wherein nitrogen or chalcogen (i.e, oxygen, sulfur, selenium or tellurium) is in the chain between the hetero ring and cyclopentanohydrophenanthrene ring system.

(1) Note. Examples of compounds provided for herein are: [figure]