Hebei Chemical Industry Institute
trichloromethyl sucrose ( cane sugar element );; 2, 2- methyl butyric acid; 2, 2- methyl n-butyryl chloride; N, N- dimethylacetamide; n-methyl acetamide; 5- nicotinic acid; 2- nicotinic acid; thioctic acid; 5- nicotinic acid;
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