Accurate mass spectra of [M+H]+ and
[MH] ions were recorded from 100 to 1000 m/z, the mass res-
olution power of the analyzer was set to 30,000 (m/Dm) at m/z
400. Nitrogen (99.95%) was used both as sheath gas and auxiliary
gas, employed as the collision gas in the HCD cell and the bath
gas in the C-trap.