ChemInform Abstract: STUDIES ON THE BIOSYNTHESIS OF BETA-LACTAM ANTIBIOTICS PART 1, STEREOSPECIFIC SYNTHESES OF (2RS,3S)-(4,4,4-(2)H3)-, (2RS,3S)-(4-(3)H)-, (2RS,3R)-(4-(3)H)-, AND (2RS,3S)-(4-(13)C)-VALINE, INCORPORATION OF (2RS,3S)-(4-(13)C)-VALINE INTO

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