Oxalic acid:
Oxalic acid is an organic compound with the formula H2C2O4. It is a colorless crystalline solid that, when dissolved in water, forms a colorless solution.
en.wikipedia.org
草酸:
草酸（英文：Oxalic acid），也称乙二酸，是一種強有機酸，化學式為 H2C2O4.。
zh.wikipedia.org
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Oxalic acid草酸