Table I.

Compound Parameters for Multiple Reaction Monitoring

Compound	Q1 mass (Da)	Q3 mass (Da)	Declustering potential(DP)	Entrance potential (EP)	Collision energy (CE)	Collision cell exit potential (CXP)
C16‐S1P	350.2	78.9	−90	−10	−48	−5
C17‐S1P	364.2	78.9	−90	−10	−48	−5
C18:1‐S1P	376.2	78.9	−95	−8	−62	−5
C18‐S1P	378.2	78.9	−95	−8	−62	−5
C20‐S1P	406.3	78.9	−95	−8	−62	−5