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The DNA bisintercalator triostin A is structurally based on a disulfide‐bridged depsipeptide scaffold that provides preorganization of two quinoxaline units in 10.5 Å distance. Triostin A analogues are synthesized with nucleobase recognition units replacing the quinoxalines and containing two additional recognition units in between. Thus, four nucleobase recognition units are organized on a rigid template, well suited for DNA double strand interactions. The new tetra‐nucleobase binders are synthesized as aza‐TANDEM derivatives lacking the N‐methylation of triostin A and based on a cyclopeptide backbone. Synthesis of two tetra‐nucleobase aza‐TANDEM derivatives is established, DNA interaction analyzed by microscale thermophoresis, cytotoxic activity studied and a nucleobase sequence dependent self‐aggregation investigated by mass spectrometry.

Triostin A Derived Cyclopeptide as Architectural Template for the Alignment of Four Recognition Units