3,5-Dibromo-4-methoxybenzoic acid was isolated from the Malagasy sponge Amphimedon sp.

Monoethyl malonic acid belongs to the class of organic compounds known as dicarboxylic acids and derivatives. These are organic compounds containing exactly two carboxylic acid groups. Monoethyl malonic acid exists as a solid soluble (in water) and a weakly acidic compound (based on its pKa).

L,L-Dityrosine is a constituent of acid hydrolysates of a number of biological materials, including the insect cuticular resilin.?