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. 2018 Feb 5;9:497. doi: 10.1038/s41467-018-02902-z

Fig. 5.

Fig. 5

High resolution electrospray ionization mass spectrometry (HR-ESI-MS) spectra of G4 dendrons. A single-13+ ion specie was observed in the ESI-MS spectrum a, which representing the [M–13PF6]13+ ion of G4 dendrons. The isotopic pattern b of experimental result was consistent with the theoretical simulation, confirming the successful synthesis of G4 dendrons