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The bare deprotonated penicillin G, and its complexes with the Ba 2+ , Zn 2+ and Cd 2+ ions, have been formed by electrospray ionization and studied by IRMPD (infrared multiple photon dissociation) spectroscopy using FT-ICR (Fourier-transform ion cyclotron resonance) mass spectrometry with the FELIX free electron laser infrared light source. The spectra in the 900–2000cm ...
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