Ethyl (E,4S)-4-[[(2S)-2-[[(2S)-2-[[(2S)-2-(furan-3-carbonylamino)-3-methylbutanoyl]amino]-3-methylbutanoyl]amino]-4-methylpentanoyl]amino]-5-[(3S)-2-oxopyrrolidin-3-yl]pent-2-enoateについたふせん (0)