US PATENT SUBCLASS 552 / 618
.~.~.~ The A ring is a benzene ring

Current as of: June, 1999
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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}
612  DF  .~.~ Three or more oxygens bonded directly to the cyclopentanohydrophenanthrene ring system {6}
618.~.~.~ The A ring is a benzene ring

DEFINITION

Classification: 552/618

(under subclass 612) Compounds in which the A ring of the cyclopentanohydrophenanthrene ring system contains three alternating double bonds (i.e., is a benzene ring).