[(1R)-2-(4-hydroxyphenyl)-1-[[(1S)-1-[[(2S)-3-methyl-2-methylamino-but anoyl]carbamoyl]-2-phenyl-ethyl]amino]ethyl]phosphonic acid;antibiotic K 4;Nα-(N-Acetyl-L-isoleucyl)-N-[2-(4-hydroxyphenyl)-1-phosphonoethyl]-L-tyrosinamide
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