141205-31-4 Microcolin A Threoninamide, N-(2,4-dimethyl-1-oxooctyl)-N-methylleucyl-N-(1-((2-((2,5-dihydro-2-methyl-5-oxo-1H-pyrrol-1-yl)carbonyl)-4-hydroxy-1-pyrrolidinyl)carbonyl)-2-methylpropyl)-N-methyl-, 23-acetate