N-ALPHA-CARBOBENZOXY-L-ASPARAGINE T-BUTYL ESTER Z-L-ASPARAGINE T-BUTYL ESTER Z-L-ASPARAGINE TERT-BUTYL ESTER Z-ASPARAGINE-OTBU Z-ASN-OTBU N-CBZ-L-asparaginet-butylester N-S-CBZ-L-ASPARAGINE S-TERT-BUTYL ESTER Nα-Z-L-asparaginetert-butyl ester99%