AMAS is a non-cleavable (non-degradable) heterobifunctional cross-linker with NHS ester and maleimide groups, which allows the covalent binding of amine- and thiol-containing molecules and is widely used in ADCs. linker.

Physicochemical Properties

Molecular Formula	C10H8N2O6
Molecular Weight	252.1803
Exact Mass	252.038
CAS #	55750-61-3
PubChem CID	3299229
Appearance	White to off-white solid powder
Density	1.6±0.1 g/cm3
Boiling Point	430.1±47.0 °C at 760 mmHg
Melting Point	174-175ºC
Flash Point	213.9±29.3 °C
Vapour Pressure	0.0±1.0 mmHg at 25°C
Index of Refraction	1.620
LogP	-2.21
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	6
Rotatable Bond Count	4
Heavy Atom Count	18
Complexity	461
Defined Atom Stereocenter Count	0
InChi Key	TYKASZBHFXBROF-UHFFFAOYSA-N
InChi Code	InChI=1S/C10H8N2O6/c13-6-1-2-7(14)11(6)5-10(17)18-12-8(15)3-4-9(12)16/h1-2H,3-5H2
Chemical Name	(2,5-dioxopyrrolidin-1-yl) 2-(2,5-dioxopyrrol-1-yl)acetate
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

Solubility Data

Solubility (In Vitro)

DMSO : ~100 mg/mL (~396.54 mM)

Solubility (In Vivo)

Solubility in Formulation 1: ≥ 2.5 mg/mL (9.91 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 (9.91 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 (9.91 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	3.9654 mL	19.8271 mL	39.6542 mL
	5 mM	0.7931 mL	3.9654 mL	7.9308 mL
	10 mM	0.3965 mL	1.9827 mL	3.9654 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.