US PATENT SUBCLASS 540 / 108
.~.~.~.~ The hetero ring is five-membered and has plural hetero atoms

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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}
108.~.~.~.~ The hetero ring is five-membered and has plural hetero atoms

DEFINITION

Classification: 540/108

(under subclass 107) Compounds wherein the hetero ring is five-membered and contains at least two hetero atoms.

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