US PATENT SUBCLASS 568 / 49
.~.~.~.~.~ Plural rings 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}
18  DF  .~ SULFUR CONTAINING {9}
38  DF  .~.~ Thioethers {5}
39  DF  .~.~.~ Oxygen containing {6}
45  DF  .~.~.~.~ Plural oxygens containing {3}
49.~.~.~.~.~ Plural rings containing

DEFINITION

Classification: 568/49

(under subclass 45) Compounds which contain at least two rings.