What could be a +71 Da impurity in cyclic peptide synthesis ?

First, I synthesized by SPPS with Fmoc strategy the linear peptide : D-Glu(OtBu)-L-Lys(Alloc)-D-Glu(OtBu)-L-Ala-D-Glu(OtBu)-L-Lys(Alloc)-D-Glu(OtBu)-L-Ala. After cleavage from the resin...

27 May 2021 8,539 4 View