3-Hydroxy-4-mentnylhoxy benzaidchyde

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　　2-Amino-5-chlorophcnyl-2'fluoro-peny lmenthaninc

Alkalinity epoxy
anion exchange resin

2-Fluorobenzoic acid

3-Hydroxy-4-
mentnylhoxy benzaidchyde

Brompheniramine
hydrogen maleate

2-Amino-5-chlorophcnyl-2'fluoro-peny lmenthaninc

Alkalinity epoxyanion exchange resin

2-Fluorobenzoic acid

3-Hydroxy-4-mentnylhoxy benzaidchyde

Brompheniramine hydrogen maleate

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