US PATENT SUBCLASS 540 / 94
.~.~.~ Hetero ring attached directly to the cyclopentanohydrophenanthrene ring system by nonionic bonding

Current as of: June, 1999
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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}
94.~.~.~ Hetero ring attached directly to the cyclopentanohydrophenanthrene ring system by nonionic bonding {3}
95  DF  .~.~.~.~> The hetero ring contains nitrogen {2}
100  DF  .~.~.~.~> The hetero ring contains plural chalcogens {1}
102  DF  .~.~.~.~> The hetero ring contains -C(=X)-O-, wherein X is chalcogen, as part of the ring (e.g., lactones, etc.) {3}

DEFINITION

Classification: 540/94

(under subclass 2) Compounds in which a hetero ring is attached directly to the cyclopentanohydrophenanthrene ring system by nonionic bonding.

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