Imidacloprid-urea is a secondary metabolite of imidacloprid. Imidacloprid is a potent and widely used neonicotinoid with inhibitory effects on pests of cereals, vegetables, tea and cotton.

25-Dimethylpyrazine is present in asparagus wheat bread crispbread Swiss cheeses black or green tea soya malt raw shrimp and squid. 25-Dimethylpyrazine is used as flavor additive and odorant in foods.

L-Leucyl-L-alanine is a dipeptide composed of L-leucine and L-alanine joined by a peptide linkage.