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“In contrast, L-amino-acids behaved differently: In assays with IMI , 9 out of 13 isomers were ineffective whereas 3 were antagonistic (L-phenylalanine, L-serine , L-tryptophan).”
The Journal of antimicrobial chemotherapy • 1983 | View Paper
“Cefoxitin and N-formimidoylthienamycin are potent anti-bacterial agents; they effectively inactivate the serine R39 enzyme and, to a lesser extent, the serine R61 enzyme.”