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5-Chloropyrazine-2-carboxylic acid hydrazide: BD159154848952-83-098%; ￥1429.01g

3-Aminopyrazine-2-carbohydrazide: BD845656761-52-097%; ￥1343.010g

Pyrazinoic acid hydrazide: BD29592768-05-897%; ￥1083.0100g

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