Mal-Propionyl-PEG8-Val-Cit-PAB(m-PEG4) DBCO 677 SMILES: [O-]C(=O)C1=CC=C(C=C1C1=C2C=C3CCC[N+]4=C3C(CCC4)=C2OC2=C3CCCN4CCCC(C=C12)=C34)C(=O)NCC#C Purity (HPLC):

677 SMILES: [O-]C(=O)C1=CC=C(C=C1C1=C2C=C3CCC[N+]4=C3C(CCC4)=C2OC2=C3CCCN4CCCC(C=C12)=C34)C(=O)NCC#C Purity (HPLC): ≥ 95% Shipping Conditions: room temperature Storage Conditions: Refrigerated Regulatory Statement: For Research Use Only

445 SMILES OCCCCCCNC(=O)COC1=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

Good solubility in organic solvents

66 Purity (HPLC) >= 95% Physical Appearance Red Solid Optical Properties Abs/Em Maxima: 558/578 nm Solubility DMSO

Mal-Propionyl-PEG8-Val-Cit-PAB(m-PEG4) DBCO 677 SMILES: [O-]C(=O)C1=CC=C(C=C1C1=C2C=C3CCC[N+]4=C3C(CCC4)=C2OC2=C3CCCN4CCCC(C=C12)=C34)C(=O)NCC#C Purity (HPLC):SOLU KNEX cleavable linker features a Val Cit dipeptide. The conventional maleimidocaproyl (MC) unit is replaced by Mal Propionyl PEG8 moiety to enhance aqueous solubility. The Mal Propionyl group may also improve retro Michael addition stability during antibody conjugation. m PEG4 is attached to the commonly used self immolative para aminobenzyl (PAB) moiety to increase aqueous solubility. Derived from established ADC linker architectures, SOLU KNEX