L-组氨酸

甲基碘

N(α)-benzyloxycarbonyl-N(π)-t-butoxymethyl-L-histidine methyl ester

N(α)-benzyloxycarbonyl-N(π)-(2-trimethylsilylethoxy)methyl-L-histidine methyl ester

N(α)-benzyloxycarbonyl-N(τ)-(2-trimethylsilylethoxy)methyl-L-histidine methyl ester