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1-{[(4R,7S,10S,16R)-7-(2-amino-2-oxoethyl)-13-[(2S)-butan-2-yl]-16-(1H-indol-3-ylmethyl)-6,9,12,15,18-pentaoxo-10-(propan-2-yl)-1,2-dithia-5,8,11,14,17-pentaazacycloicosan-4-yl]carbonyl}-L-prolyl-L-or related products: