141205-32-5 Microcolin B Threoninamide, N-(2,4-dimethyl-1-oxooctyl)-N-methylleucyl-N-(1-((2-((2,5-dihydro-2-methyl-5-oxo-1H-pyrrol-1-yl)carbonyl)-1-pyrrolidinyl)carbonyl)-2-methylpropyl)-N-methyl-, acetate (ester)