Figure 5.

Positive mode electrospray ionization MS analysis of the F'3 fraction. Despite the fact that the molecular ion at m/z 512 (M+ H)⁺ is not observed, the presence of ions at both m/z 494 (M- H₂O)⁺ and m/z 534 (M + Na)⁺ enables this compound to be identified as verruculogen [16].