Alternating iterative exponential growth oligomers as a sequence-defined platform for hydrophilic antibody-drug conjugates.

Antibody-drug conjugates (ADCs) are a powerful therapeutic modality capable of tissue-specific delivery of highly potent cytotoxic warheads. One of the key challenges of ADCs is their hydrophobicity. Conjugation of typically hydrophobic cytotoxins to an antibody alters its physicochemical properties, resulting in decreased stability and poor pharmacokinetics. Herein, we report the synthesis of alternating iterative exponential growth (IEG) oligomers bearing orthogonal functionalities that serve as a versatile platform for installing diverse hydrophilic moieties and cytotoxic payloads. Incorporation of hydrophilic groups can partially offset payload hydrophobicity, yielding ADCs with improved overall hydrophilicity.