(2R)-5-[[amino-[(2,2,4,6,7-pentamethyl-3H-1-benzofuran-5-yl)sulfonylamino]methylidene]amino]-2-(9H-fluoren-9-ylmethoxycarbonylamino)pentanoic acid,(2R)-5-[[amino-[(2,2,4,6,7-pentamethyl-3H-1-benzofuran-5-yl)sulfonylamino]methylidene]amino]-2-(9H-fluoren-9-ylmethoxycarbonylamino)pentanoic acid,Leucine
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