Table 1.

Mass spectrometry parameters for MRM mode.

Compound	Precursor Ion	Product Ion	Q1, V	CE, V	Q3, V
Metronidazole	172.1	128.1	−11	−17	−12
		82.1	−11	−25	−14
Hydroxymetronidazole	188.1	123.1	−12	−13	−12
		126.1	−12	−17	−12
Metronidazole-D3	175.1	131.1	−11	−17	−12
Hydroxymetronidazole-D2	190.1	125.1	−13	−15	−12