US PATENT SUBCLASS 568 / 807
.~.~.~.~ Additional ring containing

Current as of: June, 1999
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568 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {4}
300  DF  .~ OXYGEN CONTAINING (E.G., PERCHLORYLBENZENE, ETC.) {11}
700  DF  .~.~ Hydroxy containing (H of -OH may be replaced by a Group IA or IIA light metal) {10}
715  DF  .~.~.~ Benzene ring containing {8}
807.~.~.~.~ Additional ring containing {2}
808  DF  .~.~.~.~.~> Polycyclo ring system
809  DF  .~.~.~.~.~> Plural benzene rings bonded directly to the same carbon

DEFINITION

Classification: 568/807

Additional ring containing:

(under subclass 715) Compounds which contain at least one

other carbocyclic ring.