Table 4. Analytical data for peptides synthesized in this study.

HPLC k′ = (peptide retention time - solvent retention time) / solvent retention time. System 1 is a 10% to 90% gradient of acetonitrile in water containing 0.1% trifluoroacetic acid over 35 minutes at a flow rate of 1.5 mL/min, and system 2 is the same gradient with methanol replacing acetonitrile. Product purity is determined using solvent system which showed the least purity and integrating the area under the curves of the chromatograms collected at 214 nm. Mass observed was calculated from the M+1 or (M+2)/2 peak.