. 2020 Oct 15;413(1):225–233. doi: 10.1007/s00216-020-02994-x

Table 1.

Full list of the MS/MS transitions for analytes and internal standards

	Name	Elemental composition	Precursor ion	Precursor (Q1) calculated mass (Da)	Fragment (Q3) calculated mass (Da)
1	Norfentanyl	C₁₄H₂₀N₂O	[M + H]⁺	233.1648	84.0808
2	Acetylfentanyl	C₂₁H₂₆N₂O	[M + H]⁺	323.2118	188.1434
3	Ocfentanil	C₂₂H₂₇FN₂O₂	[M + H]⁺	371.2129	188.1434
4	Acrylfentanyl	C₂₂H₂₆N₂O	[M + H]⁺	335.2118	188.1434
5	4-ANPP	C₁₉H₂₄N₂	[M + H]⁺	281.2012	188.1434
6	Fentanyl	C₂₂H₂₈N₂O	[M + H]⁺	337.2274	188.1434
7	Furanylfentanyl	C₂₄H₂₆N₂O₂	[M + H]⁺	375.2067	188.1434
8	α-Methylfentanyl	C₂₃H₃₀N₂O	[M + H]⁺	351.2431	202.159
9	Cyclopropylfentanyl	C₂₃H₂₈N₂O	[M + H]⁺	349.2274	188.1434
10	Carfentanil	C₂₄H₃₀N₂O₃	[M + H]⁺	395.2329	335.2118
11	Butyrfentanyl	C₂₃H₃₀N₂O	[M + H]⁺	351.2431	188.1434
12	4-Fluorobutyrfentanyl	C₂₃H₂₉FN₂O	[M + H]⁺	369.2337	188.1434
IS1	Norfentanyl-d₅	C₁₄H₁₅ ²H₅N₂O	[M + H]⁺	238.1962	–
IS2	Fentanyl-d₅	C₂₂H₂₃²H₅N₂O	[M + H]⁺	342.2588	188.1434