The alternative subdistribution β and γ can be attributed to the same polymer bearing potassium and sodium ion doping, respectively (Figure ) ). The broad signal could be attributed to either a partially hydrolyzed α-terminus or a fragmented 4MTPPC α-termini bearing potassium(α) and sodium (β) ion doping, respectively. The obtained signals could also be attributed to the desired PSar with a carbamic acid terminus. However, the latter species seems to be improbable, considering that this rather unstable species have not been reported before for PSar MALDI-ToF mass spectra.