64295-19-8 Alanine, N-(N-(N-(1-((1,1-dimethylethoxy)carbonyl)-L-prolyl)-2-methylalanyl)-L-alanyl)-2-methyl-, methyl ester Boc-pro-aib-ala-aib-ome tert-Butyloxycarbonyl-prolyl-2-aminoisobutyryl-alanyl-2-aminoisobutyrate methyl ester