Azetidine-2-carboxylic acid is a non proteinogenic amino acid homologue of proline found in common beets. Azetidine-2-carboxylic acid can be misincorporated into proteins in place of proline in many species including humans. It is a toxic and teratogenic agent.

Calcein is a fluorescent dye and self-quenching probe that used as an indicator of lipid vesicle leakage,and a complexometric indicator for titration of calcium ions with EDTA, and for fluorometric determination of calcium.

Eicosane is a natural product from Sargassum fusiforme.