US PATENT SUBCLASS 540 / 98
.~.~.~.~.~.~ The A ring is a benzene ring

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}
97  DF  .~.~.~.~.~ The hetero ring is bonded directly at the 3-position of the cyclopentanohydrophenanthrene ring system {2}
98.~.~.~.~.~.~ The A ring is a benzene ring

DEFINITION

Classification: 540/98

(under subclass 97) Compounds in which the A ring of the

cyclopentanohydrophenanthrene ring system contains three alternating double bonds (i.e., is a benzene ring).

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