Fig. 4

LC/ESI-MS analysis of the reaction between PM (0.1 mM) and (A) DPA (0.1 mM) or (C) IPT (0.1 mM) at 37 °C for 48 h. Proposed mechanisms for the reaction between PM and (B) DPA or (D) IPT.

LC/ESI-MS analysis of the reaction between PM (0.1 mM) and (A) DPA (0.1 mM) or (C) IPT (0.1 mM) at 37 °C for 48 h. Proposed mechanisms for the reaction between PM and (B) DPA or (D) IPT.