Phe-Lys(Fmoc)-PAB is a cleavable (degradable) ADC (Antibody-drug conjugate) linker that may be utilized to prepare antibody-conjugated active molecules (ADC).

Physicochemical Properties

Molecular Formula	C37H40N4O5
Molecular Weight	620.7373
Exact Mass	620.299
CAS #	2149584-03-0
PubChem CID	129896979
Appearance	Off-white to light yellow solid powder
LogP	4.6
Hydrogen Bond Donor Count	5
Hydrogen Bond Acceptor Count	6
Rotatable Bond Count	15
Heavy Atom Count	46
Complexity	943
Defined Atom Stereocenter Count	2
SMILES	C1=CC=C(C=C1)C[C@@H](C(=O)N[C@@H](CCCCNC(=O)OCC2C3=CC=CC=C3C4=CC=CC=C24)C(=O)NC5=CC=C(C=C5)CO)N
InChi Key	RCPHMUPZDFKBDS-HEVIKAOCSA-N
InChi Code	InChI=1S/C37H40N4O5/c38-33(22-25-10-2-1-3-11-25)35(43)41-34(36(44)40-27-19-17-26(23-42)18-20-27)16-8-9-21-39-37(45)46-24-32-30-14-6-4-12-28(30)29-13-5-7-15-31(29)32/h1-7,10-15,17-20,32-34,42H,8-9,16,21-24,38H2,(H,39,45)(H,40,44)(H,41,43)/t33-,34-/m0/s1
Chemical Name	9H-fluoren-9-ylmethyl N-[(5S)-5-[[(2S)-2-amino-3-phenylpropanoyl]amino]-6-[4-(hydroxymethyl)anilino]-6-oxohexyl]carbamate
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	Cleavable Linker Protease Cleavable Linker
References	[1]. Abu Ajaj K, et al. Development of protein-binding bifunctional linkers for a new generation of dual-actingprodrugs. Bioconjug Chem. 2009 Feb;20(2):390-6.

Solubility Data

Solubility (In Vitro)

DMSO : 100 mg/mL (161.10 mM)

Solubility (In Vivo)

Solubility in Formulation 1: ≥ 2.5 mg/mL (4.03 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 (4.03 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 (4.03 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	1.6110 mL	8.0549 mL	16.1098 mL
	5 mM	0.3222 mL	1.6110 mL	3.2220 mL
	10 mM	0.1611 mL	0.8055 mL	1.6110 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.