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Diethyl L-glutamate hydrochloride H-GLU-TRP-OH L-Glutamic acid α-tert·butyl ester Boc-L-glutamic acid 1-tert-butyl ester BOC-GLU(OME)-OH Z-GLU(OME)-OH Boc-L-Glutamic acid 1-benzyl ester L-Glutamic acid di-tert-butyl ester hydrochloride N-(4-NITROBENZOYL)-L-GLUTAMIC ACID DIETHYL ESTER L-Glutamic acid dibenzyl ester tosylate