Table 1.

Optimized MS/MS parameters for melatonin, melatonin‐D4, and IMPY.

Compound	m/z	DP	EP	CE	CXP	CUR	CAD	IS	TEM	GS1	GS2
Melatonin	233.1/174.1	40	7	20	4	35	10	4500	450	40	40
	233.1/159.1	44	8	40	5	35	10	4500	450	40	40
Melatonin‐D4	237.2/178.2	48	8	25	3	35	10	4500	450	40	40
	237.2/163.3	45	6	30	3	35	10	4500	450	40	40
IMPY	364.1/236.3	60	10	48	3	35	10	4500	450	40	40
	364.1/348.2	70	7	49	7	35	10	4500	450	40	40
	364.1/193.3	80	10	67	3	35	10	4500	450	40	40