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Urea - is an organic compound with the chemical formula CO(NH2)2. The molecule has two -NH2 groups joined by a carbonyl (C=O) functional group.
U 1305 (OTTO) Urea, 99% Cas 57-13-6 - used with guanidine hydrochloride and dithiothreitrol (DTT) in the refolding of denatured proteins into their native or active form.