alents of salicylaldehyde, was coupled with N-benzyloxycarbonylglycine-N-hydroxysuccinimide active ester,",") N-benzyloxycarbonyl-fl-alanine N-hydroxy-5-norbornene-2,3-dicarboximide active ester," N-benzyloxycarbonylsarcosine N-hydroxy-5-norbornene-2,3-dicarboximide active ester, and L-2-hydroxy-4-N