US PATENT SUBCLASS 552 / 513
.~.~.~ The additional ring shares the 6,7-positions of the cyclopentanohydrophenanthrene ring system

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

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {11}
502  DF  .~ Cyclopentanohydrophenanthrene ring system containing {21}
510  DF  .~.~ The cyclopentanohydrophenanthrene ring system is part of a polycyclo ring system having at least five cyclos {4}
513.~.~.~ The additional ring shares the 6,7-positions of the cyclopentanohydrophenanthrene ring system

DEFINITION

Classification: 552/513

(under subclass 510) Compounds in which the additional ring is otho-fused to the B ring of the cyclopentanohydrophenanthrene ring system at the 6,7-positions.

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