N-(benzyloxycarbonyl)-β-alanine (9-methoxy-3-oxo-3H-benzo[f]benzopyran-1-yl)methyl ester
N-(benzyloxycarbonyl)-O-(tert-butoxycarbonyl)-L-tyrosine (9-methoxy-3-oxo-3H-benzo[f]benzopyran-1-yl)methyl ester
N-(benzyloxycarbonyl)-3,4-dihydroxy-L-phenylalanine (9-methoxy-3-oxo-3H-benzo[f]benzopyran-1-yl)methyl ester
N-(benzyloxycarbonyl)-L-valine (9-methoxy-3-thioxo-3H-benzo[f]benzopyran-1-yl)methyl ester
N-(tert-butyloxycarbonyl)-3,4-dihydroxy-L-phenylalanine (9-methoxy-(5,6)-benzocoumarin-1-yl)methyl ester