US PATENT SUBCLASS 534 / 842
.~.~.~.~.~ Hydroxy bonded directly at the 2-position of the bicyclo ring system (H of hydroxy may be replaced by the ammonium ion or a Group IA or IIA light metal)

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

*  DD  ORGANIC COMPOUNDS (CLASS 532, SUBCLASS 1) {8}
573  DF  .~ Azo {51}
838  DF  .~.~ Exactly one azo group containing or azo attached indirectly to an additional azo group by ionic bonding {3}
839  DF  .~.~.~ Plural benzene rings bonded directly to the azo group {5}
840  DF  .~.~.~.~ Each of the benzene rings is part of a bicyclo ring system {2}
842.~.~.~.~.~ Hydroxy bonded directly at the 2-position of the bicyclo ring system (H of hydroxy may be replaced by the ammonium ion or a Group IA or IIA light metal)

DEFINITION

Classification: 534/842

(under subclass 840) Compounds wherein -OH is bonded directly

at the 2-position of the bicyclo ring system; wherein H of the -OH may be replaced by the ammonium ion or a Group IA or IIA light metal.

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