(D-Arg)9 peptide is a peptide composed of 9 D-type arginines. It is a pair of isomers with (Arg)9 peptide and has the same molecular formula and molecular weight. The only difference is the conformational structure . (D-Arg)9 peptide also has a membrane penetrating effect and is often used as a carrier peptide. From a production point of view, (D-Arg)9 peptide and (Arg)9 peptide have almost the same peptide synthesis process.