Phenylephrine
Boltia, S. A., A. T. Soudi, E. S. Elzanfaly, and H. E. Zaazaa,
"Simultaneous Quantification of Chlorpheniramine, Phenylephrine, Guaifenesin in Presence of Preservatives with Detection of Related Substance Guaiacol in their Cough Syrup by RP-HPLC and TLC-Densitometric Methods",
Journal of Chromatographic Science, vol. 57, issue 6, pp. 552-559, 2019.