Complete stereochemistry of neamphamide A and absolute configuration of the beta-methoxytyrosine residue in papuamide

A study determines the absolute stereochemistry of the three unresolved structural components in neamphamide A and the beta-methoxytyrosine residue in papuamide B. The findings represent a rare example of divergent stereochemistry in an unusual amino acid residue that is present in two closely related classes of peptides.