Figure 4

(a) MS/MS spectra of TetraHexCer(t18:1/24:1-OH) in ESI− mode and fragment nomenclature. (b) Theoritical cross-ring fragmentation pattern of the fourth hexose unit from the non-reducing end for each different linkage position (1 → 4, 1 → 3, 1 → 6, 1 → 2).