The metabolite map of ATV. All metabolites were determined by accurate mass and mass fragmentations. Overall, 18 ATV metabolites were identified, including 5 previously reported metabolites (M1, M2, M6, M13, and M14) (ter Heine et al., 2009) and 13 novel metabolites. Among these novel ATV metabolites, one aromatic aldehyde (m1), one α-hydroxyaldehyde (M15′), and one hydrazine (M16) were detected and characterized.