Mal-Acetyl-Dap(m-PEG4)-Gly-Gly-Phe-Gly-PAB(m-PEG4)-MMAE Lenalidomide 84 SMILES CC(C)(C)OC(=O)CN1CCN(CC(=O)NCCCO)CCN(CC(=O)OC(C)(C)C)CCN(CC(=O)OC(C)(C)C)CC1 Purity (HPLC)

84 SMILES CC(C)(C)OC(=O)CN1CCN(CC(=O)NCCCO)CCN(CC(=O)OC(C)(C)C)CCN(CC(=O)OC(C)(C)C)CC1 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

Product Name Fmoc-Gly-Gly-Phe-Gly-PAB(m-PEG8) Synonyms CAS Number Related CAS Molecular Formula C55H72N6O16 Molecular Weight 1073

74 SMILES CC1=C(SC=N1)C1=CC=C(CNC(=O)[C@@H]2C[C@@H](O)CN2C(=O)[C@@H](NC(=O)CCOCCOCCO)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

NCCOCCOCCCC1=C2CN(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

Binfunctional amine-amine linker

Mal-Acetyl-Dap(m-PEG4)-Gly-Gly-Phe-Gly-PAB(m-PEG4)-MMAE Lenalidomide 84 SMILES CC(C)(C)OC(=O)CN1CCN(CC(=O)NCCCO)CCN(CC(=O)OC(C)(C)C)CCN(CC(=O)OC(C)(C)C)CC1 Purity (HPLC)SOLU KNEX cleavable linker features a Gly Gly Phe Gly (GGFG) peptide. In this product, a Mal Acetyl Dap(m PEG4) moiety replaces the conventional maleimidocaproyl (MC) unit to enhance aqueous solubility. The Mal Acetyl group may also improve retro Michael addition stability during antibody conjugation. Additionally, m PEG4 is attached to the commonly used self immolative para aminobenzyl (PAB) moiety to further increase aqueous solubility. The payload