Figure 6

Negative-ion MALDI-QIT-TOF MS4 spectrum of m/z 1348.16 corresponding to removal of acyl group at C-3′ (A) and fragment structures (B).

Negative-ion MALDI-QIT-TOF MS4 spectrum of m/z 1348.16 corresponding to removal of acyl group at C-3′ (A) and fragment structures (B).