Observed accurate (m/z)^c

ID

Proposed Formula

Theoretical accurate Mass^b (m/z)

Error (ppm)^d

557.24350

Parent

${\text{C}}_{\text{33}}{\text{H}}_{34}{\text{FN}}_{\text{2}}{\text{O}}_5^{-}$

557.2457

−4

453.19515

F2

${\text{C}}_{29}{\text{H}}_{26}{\text{FN}}_{\text{2}}{\text{O}}_2^{-}$

453.1984

−7

397.17220

F3

C₂₆H₂₂FN₂O⁻

397.1722

0

278.13903

F4

C₁₉H₁₇FN⁻

278.1351

14

262.10266

F9

C₁₈H₁₃FN⁻

262.1038

−4.3