Gly-Gly-Phe-Gly-PAB(m-PEG8) Size:10mg 004 SMILES CC(C)(C)OC(=O)CN1CCN(CC(=O)NCCCCNC(=O)CCN2C(=O)C=CC2=O)CCN(CC(=O)OC(C)(C)C)CCN(CC(=O)OC(C)(C)C)CC1 Purity (HPLC)

004 SMILES CC(C)(C)OC(=O)CN1CCN(CC(=O)NCCCCNC(=O)CCN2C(=O)C=CC2=O)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

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

137 Purity (HPLC) >= 95% Solubility DMSO

97 SMILES ClCCOCCOCCOCCOCCC(=O)NC1=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

Gly-Gly-Phe-Gly-PAB(m-PEG8) Size:10mg 004 SMILES CC(C)(C)OC(=O)CN1CCN(CC(=O)NCCCCNC(=O)CCN2C(=O)C=CC2=O)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, m PEG8 is attached to the commonly used self immolative para aminobenzyl (PAB) moiety to increase aqueous solubility. Derived from established ADC linker architectures, SOLU KNEX ADC linkers integrate solubilizing moietiessuch as PEG, amine containing groups, or polysarcosine (PSAR), to enhance aqueous solubility. Solubility and physicochemical properties can be