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I 1553 (OTTO) Isobutyl chloroformate, 98% Cas 543-27-1 - used as a peptide reagent. I 1553 (OTTO) Isobutyl chloroformate, 98% Cas 543-27-1 - used in the preparation of phenethyl-carbamic acid isobutyl ester by reaction with phenethylamine.