US PATENT SUBCLASS 540 / 96
.~.~.~.~.~ Plural nitrogen containing hetero rings bonded directly to the cyclopentanohydrophenanthrene ring system

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  DF  .~.~.~ Hetero ring attached directly to the cyclopentanohydrophenanthrene ring system by nonionic bonding {3}
95  DF  .~.~.~.~ The hetero ring contains nitrogen {2}
96.~.~.~.~.~ Plural nitrogen containing hetero rings bonded directly to the cyclopentanohydrophenanthrene ring system

DEFINITION

Classification: 540/96

(under subclass 95) Compounds wherein at least two nitrogens containing hetero rings are bonded directly to the cyclopentanohydrophenanthrene ring system.

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