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Solid phase synthesis of l-alanyl-l-alanyl-l-1-aminoethyltetrazole 14c-LLL. Reagents and conditions: (a) piperidine, DMF; (b) HBTU, DIPEA, DMF; (c) Fmoc-l-Alanine; (d) Cbz-l-Alanine; (e) 5% TFA, 95% DCM, 1 eq TIS; (f) H2, 0.5% Pd/C, MeOH, 3 bar.
