Fig. (3) Tandem MS spectra of 2,3-DHBA and 2,5-DHBA. (A): MS/MS spectrum corresponding to the 2.87 min peak of the Udenfriend’s incubate of 2,3-DHBA (MS2 169.01 scan 50-365), (B): MS/MS spectrum corresponding to the 4.57 min peak of the Udenfriend’s incubate of 2,3-DHBA (MS2 169.01 scan 50-365), (C): MS/MS spectrum corresponding to the 4.00 min peak of the Udenfriend’s incubate of 2,5-DHBA (MS2 169.01 scan 50-365).