US PATENT SUBCLASS 552 / 9
.~.~ Cyclopentanohydrophenanthrene ring system containing

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552 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {11}
1  DF  .~ Azides {8}
9.~.~ Cyclopentanohydrophenanthrene ring system containing

DEFINITION

Classification: 552/9

(under subclass 1) Compounds which contain the cyclopentanohydrophenanthrene ring system.

(1) Note. The cyclopentanohydrophenanthrene ring system is depicted by the

following structure, in which at least one of the rings A, B and C is not a benzene ring: [figure]