for the following products
N-alpha-Benzyloxycarbonyl-o-tert-butyl-L-tyrosine dicyclohexylamine | Z-L-Tyr(tBu)-OH.DCHA | Z-O-tert-butyl-L-tyrosine dicyclohexylamine salt | Z-Tyr(But)-OH.DCHA | Z-Tyr(tBu)-OH.DCHA and Cbz-O-tert-Butyl-L-tyrosine dicyclohexylamine