Fig 1. Off-line ESI-MS of dichloromethane fraction of Vernonia polysphaera leaves extract.

The ion at m/z 301 [M+H]⁺ corresponded to diosmetin (1), the ion at m/z 317 [M+H]⁺ corresponded to isorhamnetin (2) and the ion at m/z 457 [M+H]⁺ corresponded to oleanolic acid (3).