for the following products
Boc-L-MeTyr(Bzl)-OH | Boc-MeTyr(Bzl)-OH | Boc-N-alpha-methyl-O-benzyl-L-tyrosine | Boc-N-Me-Tyr(Bzl)-OH | N-alpha-tert-Butyloxycarbonyl-N-alpha-methyl-o-benzyl-L-tyrosine and N-alpha-tert-Butyloxycabonyl-N-alpha-methyl-O-benzyl-L-tyrosine
