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Polymath FT 467

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dgr1941 | 23:43 Sat 20th Sep 2008 | Crosswords
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20a Type of organic acid used in the manufacture of phenols, dyes etc. (US spelling) (8)

-U---N-C
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quininic acid
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This affect 17d. If right then 17d cannot be OBFUSCATING !
If 17d is Obfuscating which appears likely, what letters would you have for 20a ?
sulfonic

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Polymath FT 467

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