Figure 6: Accurate MS^1–2 spectra of compound m/z 265 and molecular formula C₉H₂₀N₄O₅.

(A) MS¹ range m/z 150- 500. (B) MS² of m/z 265 with the proposed structures of fragments 191, 179 and 162. (C) Proposed structure for m/z 265 (NH₂ group can be in different positions).