N3-Ph-NHS ester is a non-cleavable (non-degradable) ADC linker that may be utilized to prepare antibody-conjugated active molecules (ADCs). N3-Ph-NHS ester is a reagent for click chemistry. It has an Azide (N3) moiety and could undergo CuAAc (copper-catalyzed azide-alkyne cycloaddition reaction) with compounds bearing an Alkyne group. SPAAC (Strain-promoted alkyne-azide cycloaddition) may also happen with compounds bearing a BCN or DBCO group.

Physicochemical Properties

Molecular Formula	C11H8N4O4
Molecular Weight	260.21
Exact Mass	260.055
CAS #	53053-08-0
PubChem CID	122153
Appearance	Off-white to yellow solid powder
Melting Point	171-172ºC
LogP	1.239
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	6
Rotatable Bond Count	4
Heavy Atom Count	19
Complexity	434
Defined Atom Stereocenter Count	0
SMILES	C1=C(C=CC(=C1)N=[N+]=[N-])C(=O)ON2C(=O)CCC2=O
InChi Key	LWAVGNJLLQSNNN-UHFFFAOYSA-N
InChi Code	InChI=1S/C11H8N4O4/c12-14-13-8-3-1-7(2-4-8)11(18)19-15-9(16)5-6-10(15)17/h1-4H,5-6H2
Chemical Name	(2,5-dioxopyrrolidin-1-yl) 4-azidobenzoate
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

Targets

Non-cleavable Linker

Solubility Data

Solubility (In Vitro)

DMSO : 31.25 mg/mL (120.10 mM)

Solubility (In Vivo)

Solubility in Formulation 1: ≥ 2.08 mg/mL (7.99 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 20.8 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: ≥ 2.08 mg/mL (7.99 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 20.8 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: ≥ 2.08 mg/mL (7.99 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 20.8 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	3.8430 mL	19.2152 mL	38.4305 mL
	5 mM	0.7686 mL	3.8430 mL	7.6861 mL
	10 mM	0.3843 mL	1.9215 mL	3.8430 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.