US PATENT SUBCLASS 552 / 508
.~.~ Spiro

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}
508.~.~ Spiro

DEFINITION

Classification: 552/508

(under subclass 502) Compounds which contain a spiro ring system.

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