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L-Leucine, N-[[[(5S)-2,3-di-O-acetyl-5-C-[[[3b,20b(S)]-20-[[[[(1-methoxycarbonyl)-3-methylbutyl]amino]carbonyl]amino]-11-oxo-30-norolean-12-en-3-yl]oxy]-4-O-[[5S-[5R*(R*)]]-2,3,4-tri-O-acetyl-5-C-[[[[ related products: