Azide-Hexanoyl-Gly-Gly-Phe-Gly-PAB(m-PEG8)-MMAE dbco 8 SMILES CC1=C(SC=N1)C1=CC=C(CNC(=O)[C@@H]2C[C@@H](O)CN2C(=O)[C@@H](NC(=O)CCOCCOCCOCCC(O)=O)C(C)(C)C)C=C1 Purity (HPLC)

8 SMILES CC1=C(SC=N1)C1=CC=C(CNC(=O)[C@@H]2C[C@@H](O)CN2C(=O)[C@@H](NC(=O)CCOCCOCCOCCC(O)=O)C(C)(C)C)C=C1 Purity (HPLC) >= 95% Shipping Conditions Room temperature Storage Conditions Refrigerated Shelf Life 12 months after the date of delivery Regulatory Statement For Research Use Only

301 SMILES OCCNC1=C2C(=O)N(C3CCC(=O)NC3=O)C(=O)C2=CC=C1 Purity (HPLC) >= 95% Shipping Conditions Room temperature Storage Conditions Refrigerated Shelf Life 12 months after the date of delivery Regulatory Statement For Research Use Only

These reactions are efficient and selective

Signal Transduction and Targeted Therapy

171 Purity (HPLC) >= 95% Solubility DMSO

Azide-Hexanoyl-Gly-Gly-Phe-Gly-PAB(m-PEG8)-MMAE dbco 8 SMILES CC1=C(SC=N1)C1=CC=C(CNC(=O)[C@@H]2C[C@@H](O)CN2C(=O)[C@@H](NC(=O)CCOCCOCCOCCC(O)=O)C(C)(C)C)C=C1 Purity (HPLC)SOLU KNEX cleavable linker features a Gly Gly Phe Gly (GGFG) peptide. m PEG8 is attached to the commonly used self immolative para aminobenzyl (PAB) moiety to increase aqueous solubility. The payload is monomethyl auristatin E (MMAE), a highly potent antimitotic agent that inhibits tubulin polymerization, leading to cell cycle arrest and subsequent apoptosis. Derived from established ADC linker architectures, SOLU KNEX ADC linkers integrate