. 2019 Jan 5;20(1):177. doi: 10.3390/ijms20010177

Table 1.

Retention time (Rt), precursor ion, molecule formula, and ultraviolet maxima (λmax) of peaks identified in ethanol extract of P. americana Mill. (EEP).

Compound	Rt (min)	Precursor Ion (m/z)	Molecular Formula	λmax (nm)
1. Homocysteine	7.70	136.04344 [M + H]⁺	C₄H₉NO₂S	264
2. Guanine	8.20	152.04841 [M + H]⁺	C₅H₅N₅O	253
3. Cytidine	8.68	244.09982 [M + H]⁺ 112.02048 [M-glu + H]⁺	C₉H₁₃N₃O₅	215, 279
4. Uridine	18.03	245.08380 [M + H]⁺ 267.06869 [M + Na]⁺	C₉H₁₂N₂O₆	261
5. Guanosine	24.02	284.10544 [M + H]⁺ 152.04486 [M-glu + H]⁺	C₁₀H₁₃N₅O₅	253