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Under a nitrogen atmosphere, a slurry of 2.7 gm (20 mmol) L-aspartic acid in 4.0 ml (100 mmol) formamide was heated at 95°-100° C. for 2 hours. Examination of the resulting homogeneous mixture by proton NMR showed that the L-aspartic acid had been completely converted to its N-formyl derivative.