Diethyl L-glutamate hydrochloride H-Glu-Trp-OH L-Glutamic acid α-tert-butyl ester Boc-L-glutamic acid 1-tert-butyl ester Boc-L-Glutamic acid 1-benzyl ester Z-Glu(OMe)-OH Boc-Glu(OMe)-OH L-Glutamic acid di-tert-butyl ester hydrochloride L-Glutamic acid dibenzyl ester tosylate L-Glutamic acid dimethyl ester hydrochloride