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A 1338 (OTTO) N4-Acetylcytosine, 99% Cas 14631-20-0 - used in the preparation of cytidine. A 1338 (OTTO) N4-Acetylcytosine, 99% Cas 14631-20-0 - used in the preparation of 1-(4-azido-4-deoxy-β-D-glucopyranosyl)cytosine.