Gas Chromatographic Analysis of Amino Acids as N-Trifluoroacetylamino Acid Methyl Esters. (academicinfluence.com)
Method3
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After nine years of hard work at the Massachusetts Institute of Technology , he became the first to discover a practical method for synthesizing penicillin V. While achieving total synthesis, Sheehan also produced an intermediate compound, 6-aminopenicillanic acid, which turned out to be the foundation of hundreds of kinds of synthetic penicillin. (academicinfluence.com)