Expanding the eggshell colour gamut: uroerythrin and bilirubin from tinamou (Tinamidae) eggshells

摘要

Molecular structures of the two eggshell pigments ( and ) identified to date, and the two new pigments ( / and ) reported here, isolated as their dimethyl esters ( and , respectively); structure of the literature-known uroerythrin dimethyl ester methyl ether is also included.