Mal-PEG1-NHS ester is a cleavable (degradable) ADC (Antibody-drug conjugate) linker based on PEG structure for the synthesis of active Antibody-drug conjugates (ADC). Mal-PEG1-NHS ester is a PEG-based PROTAC (PROteolysis TArgeting Chimera) linker that may be utilized to prepare PROTACs.

Physicochemical Properties

Molecular Formula	C13H14N2O7
Molecular Weight	310.259463787079
Exact Mass	310.08
CAS #	1807518-72-4
PubChem CID	59992617
Appearance	White to off-white solid powder
Density	1.5±0.1 g/cm3
Boiling Point	488.4±55.0 °C at 760 mmHg
Flash Point	249.2±31.5 °C
Vapour Pressure	0.0±1.2 mmHg at 25°C
Index of Refraction	1.582
LogP	-1.89
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	7
Rotatable Bond Count	8
Heavy Atom Count	22
Complexity	521
Defined Atom Stereocenter Count	0
InChi Key	AMRJPIJPLBUEHO-UHFFFAOYSA-N
InChi Code	InChI=1S/C13H14N2O7/c16-9-1-2-10(17)14(9)6-8-21-7-5-13(20)22-15-11(18)3-4-12(15)19/h1-2H,3-8H2
Chemical Name	(2,5-dioxopyrrolidin-1-yl) 3-[2-(2,5-dioxopyrrol-1-yl)ethoxy]propanoate
HS Tariff Code	2934.99.9001
Storage	Powder-20°C 3 years 4°C 2 years In solvent -80°C 6 months -20°C 1 month
Shipping Condition	Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)

Biological Activity

ln Vitro

An ADC cytotoxin is connected to an antibody by use of an ADC linker to form an ADC.

Solubility Data

Solubility (In Vitro)

DMSO : ~100 mg/mL (~322.31 mM)

Solubility (In Vivo)

Solubility in Formulation 1: ≥ 2.5 mg/mL (8.06 mM) (saturation unknown) in 10% DMSO + 40% PEG300 + 5% Tween80 + 45% Saline (add these co-solvents sequentially from left to right, and one by one), clear solution. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 25.0 mg/mL clear DMSO stock solution to 400 μL PEG300 and mix evenly; then add 50 μL Tween-80 to the above solution and mix evenly; then add 450 μL normal saline to adjust the volume to 1 mL. Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH₂ O to obtain a clear solution. Solubility in Formulation 2: ≥ 2.5 mg/mL (8.06 mM) (saturation unknown) in 10% DMSO + 90% (20% SBE-β-CD in Saline) (add these co-solvents sequentially from left to right, and one by one), clear solution. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 25.0 mg/mL clear DMSO stock solution to 900 μL of 20% SBE-β-CD physiological saline solution and mix evenly. Preparation of 20% SBE-β-CD in Saline (4°C，1 week): Dissolve 2 g SBE-β-CD in 10 mL saline to obtain a clear solution. Solubility in Formulation 3: ≥ 2.5 mg/mL (8.06 mM) (saturation unknown) in 10% DMSO + 90% Corn Oil (add these co-solvents sequentially from left to right, and one by one), clear solution. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 25.0 mg/mL clear DMSO stock solution to 900 μL of corn oil and mix evenly.  (Please use freshly prepared in vivo formulations for optimal results.)

Preparing Stock Solutions		1 mg	5 mg	10 mg
	1 mM	3.2231 mL	16.1155 mL	32.2310 mL
	5 mM	0.6446 mL	3.2231 mL	6.4462 mL
	10 mM	0.3223 mL	1.6116 mL	3.2231 mL

*Note: Please select an appropriate solvent for the preparation of stock solution based on your experiment needs. For most products, DMSO can be used for preparing stock solutions (e.g. 5 mM, 10 mM, or 20 mM concentration); some products with high aqueous solubility may be dissolved in water directly. Solubility information is available at the above Solubility Data section. Once the stock solution is prepared, aliquot it to routine usage volumes and store at -20°C or -80°C. Avoid repeated freeze and thaw cycles.