Table 2.

LC-MS parameters for analytes and internal standards.

Analyte	Precursor ion [m/z]	Product ion [m/z]	Retention time [min]
5-(3′,4′-dihydroxyphenyl)-γ-valerolactone-3′-sulphate	287	207	3.80
5-(3′,4′-dihydroxyphenyl)-γ-valerolactone-3′-O-glucuronide	383	207	3.95
13C2D2-γ-valerolactone-3′-sulphate	291	211	3.78

Compounds were detected in negative ion mode with a dwell time of 20 ms.