FMOC-D-ASN(XAN)-OH

FMOC-D-ASPARAGINE-XANTHYL

FMOC-N-GAMMA-XANTHYL-D-ASPARAGINE

N-.ALPHA.-FMOC-N-.GAMMA.-XANTHYL-D-ASPARAGINE

N-ALPHA-(9-FLUORENYLMETHYLOXYCARBONYL)-N-BETA-XANTHYL-D-ASPARAGINE

(R)-2-(((9H-fluoren-9-yl)methoxy)carbonylamino)-4-(9H-xanthen-9-ylamino)-4-oxobutanoic acid