Scheme 1.
Synthesis of CB-sC18 conjugates; a: Dde-Lys(Fmoc)-OH, HATU, DIPEA; b: 30% piperidine/DMF; c: meta-carborane-1-carboxylic acid, Oxyma, DIC; d: 3% hydrazine/DMF; e: TFA/TIS/water (95/2.5/2.5, v/v/v).
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