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N-Carbobenzyloxy-L-aspartic acid Z-ASP(OTBU)-OH DCHA N-Cbz-L-Aspartic acid 4-tert-butyl ester Z-ASP(OSU)-OBZL Z-ASP(ONP)-OBZL Z-ASP(OBZL)-OSU Z-L-ASPARTIC ACID 4-BENZYL 1-(4-NITROPHENYL) ESTER Boc-L-aspartic acid 4-benzyl ester Fmoc-L-Aspartic acid-1-benzyl ester L-Aspartic acid 4-benzyl ester