| http://www.w3.org/ns/prov#value | - This material provides an alternative source of the amino acid 6 by hydrolytic removal of the oxazolidinone group as above followed by treatment with an appropriate acid, forexample trifluoroacetic acid, to remove the butoxycarbonyl groups, catalytic hydrogenation for example over Raney nickel, to form the amino acid 8 and finally amino group protection, for example by treatment with di-tert-butyl
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