The target solutes were dissolved in dimethyl sulfoxide (Avantor Performance Materials Poland S.A., Poland) to obtain a concentration of 200 µg/mL. Detection was performed in the UV region at a wavelength of 190-300 nm. The injected volume was 5 μL, each compound was analysed in duplicate, and the difference between retention times was never more than 3%. Retention times for the studied molecules and reference standards are summarised in the supplementary material, Tables and.