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Figure 2: Chemical structures and mass spectrometry (MS) analysis spectrum of YZFDF. (a) The MS analysis spectrum of YZFDF in positive ion mode. (b) The MS analysis spectrum of YZFDF in negative ion mode. (c) The chemical structure and [M + H]+ MS analysis spectrum of bilobalide. (d) The chemical structure and [M + H]+ MS analysis spectrum of ginkgolide A. (e) The chemical structure and [M + H]+ MS analysis spectrum of ginsenoside Rg1. (f) The chemical structure and [M + H] MS analysis spectrum of cistanoside A. (g) The chemical structure and [M + H]+ MS analysis spectrum of α-asarone.