US PATENT SUBCLASS 540 / 44
.~.~.~.~.~.~ Chalcogen, halogen, or nitrogen attached indirectly to the cyclopentanohydrophenanthrene ring system by acyclic nonionic bonding


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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}
28  DF  .~.~.~.~ The spiro includes the cyclopentanohydrophenanthrene ring system and a hetero ring {6}
41  DF  .~.~.~.~.~ The spiro hetero ring contains -C(=X)-O-, wherein X is chalcogen, as part of the ring (e.g., spiro-lactones, etc.) {3}
44.~.~.~.~.~.~ Chalcogen, halogen, or nitrogen attached indirectly to the cyclopentanohydrophenanthrene ring system by acyclic nonionic bonding


DEFINITION

Classification: 540/44

(under subclass 41) Compounds in which chalcogen (i.e., oxygen, sulfur, selenium or tellurium), halogen or nitrogen is attached indirectly to the cyclopentanohydrophenanthrene ring system by acyclic nonionic bonding.

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