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Synthesis of δ-amino acids with an ether linkage in the main chain and nucleobases on the side chain as monomer units for oxy-peptide nucleic acids
Masayasu Kuwahara, Miki Arimitsu and Masahiko Sisido
Tetrahedron, Volume 55, Issue 33, 13 August 1999, Pages 10067-10078
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http://dx.doi.org/10.1016/S0040-4020(99)00541-4