Ion species

Measured m/z

Molecular formula (MFG) [M]

Difference (ppm)

Unknown-SE [M-H]⁻

405.0058

C₁₃H₁₄N₂O₉S₂

2.4

[ES]⁻

197.9858

C₇H₅NO₄S

4.3

[ES-S]⁻

229.9589

C₇H₅NO₄S₂

0.77