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CCF-642 is an inhibitor of protein disulfide isomerase (PDI). It inhibits the reducing capacity of PDI when used at a concentration of 1 µM. It inhibits proliferation in ten multiple myeloma cell lines with IC50 values of less than 1 µM. It is cytotoxic to primary cells isolated from patients with refractory myeloma who developed secondary plasma cell leukemia (IC50 = <1 µM) but not to normal bone marrow mononuclear (NLBM) cells up to a concentration of 6.75 µM. CCF-642 (3 µM) also induces acute endoplasmic reticulum (ER) stress, increasing ERK phosphorylation and dimerization of IRE1-alpha, indicating an increase in the amount of misfolded ER proteins. It increases calcium accumulation and cleaved caspase-3 in MM1.S cells and induces apoptosis. CCF-642 increases survival in a 5TGM1 mouse syngeneic model of myeloma when administered at a dose of 10 mg/kg three times per week.Formal Name: 3-(4-methoxyphenyl)-5-[(5-nitro-2-thienyl)methylene]-2-thioxo-4-thiazolidinone. CAS Number: 346640-08-2. Molecular Formula: C15H10N2O4S3. Formula Weight: 378.4. Purity: >98% (mixture of isomers). Formulation: (Request formulation change), A crystalline solid. Solubility: DMF: 10 mg/ml, DMSO: 5 mg/ml, Ethanol: 0.25 mg/ml. lambdamax: 226, 308, 411, 673 nm. SMILES: COC1=CC=C(N2C(S/C(C2=O)=C/C3=CC=C([N+]([O-])=O)S3)=S)C=C1. InChi Code: InChI=1S/C15H10N2O4S3/c1-21-10-4-2-9(3-5-10)16-14(18)12(24-15(16)22)8-11-6-7-13(23-11)17(19)20/h2-8H,1H3/b12-8+. InChi Key: SPYIETQLOVDJCF-XYOKQWHBSA-N.
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