Figure 4: ProMass HR deisotoping of ESI spectra of additional monodisperse m-dPEG®-NHS ester products m-dPEG®12-NHS ester (top: C30H55NO16•NH3: zero-charge exact mass = 702.377 Da), m-dPEG®24-NHS ester adduct (middle: zero-charge masses of (M•2NH3) = 1247.7180 Da) and NHS-dPEG®4-(m-dPEG®24)3-ester (bottom: C180H350N6O88•3NH3: zero-charge exact mass = 4055.387 Da.
