3S, 4R, 5S 3 3S, 4S, 5R COOCH3 On 4 5 HN NH2.H3PO4 2 3R, 4S, 5S 4 3R, 4R, 5S

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A: 1679 cm-1  => acid group3069cm-1 => O-H bond2967-2334 cm-1 => C-C bond

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