Primary structure of gomesin and its analogues.

aZ = pyroglutamic acid, lowercase letters denote D-amino acids, X = Rh-Lys, Rh = rhodamin; B = B12-Lys, B12 = biotin. bThe observed m/z of the unresolved peak was compared with the calculated [M + H]+ average mass in Da.cPercent purity as determined by HPLC analysis performed on a Waters Nova-Pak C18 (2,1×150 mm, 60 Å, 3,5 µm); UV detection at 214 nm; 0.4 mL/min flow rate; [A] = 0.1% TFA in H2O and [B] = 0.1% TFA in 60% MeCN/H2O; gradient = 5–95%B in 30 min.