Product Information
Biological Information
Primary TargetHSP70
Primary Target IC<sub>50</sub>0.6uM
Purity≥99% by HPLC
Physicochemical Information
Cell permeableY
Materials Information
Toxicological Information
Safety Information according to GHS
Safety Information
Product Usage Statements
Storage and Shipping Information
Ship Code Shipped at Ambient Temperature or with Blue Ice or with Dry Ice
Toxicity Standard Handling
Storage +2°C to +8°C
Protect from Light Protect from light
Do not freeze Ok to freeze
Special InstructionsFollowing reconstitution, aliquot and freeze (-20°C). Stock solutions are stable for up to 3 months at -20°C.
Packaging Information
Packaged under inert gas Packaged under inert gas
Transport Information
Supplemental Information


HSP70 Activator II, YM-08 - Calbiochem SDS


Safety Data Sheet (SDS) 


Reference overview
Miyata, Y., et al. 2013. ACS Chem. Neurosci. 4, 930.
Data Sheet

Note that this data sheet is not lot-specific and is representative of the current specifications for this product. Please consult the vial label and the certificate of analysis for information on specific lots. Also note that shipping conditions may differ from storage conditions.

Revision20-September-2013 JSW
Synonyms(2Z,5E)-3-ethyl-5-(3-methylbenzo[d]thiazol-2(3H)-ylidene)-2-(pyridin-2-ylmethylene)thiazolidin-4-one, Heat Shock 70 kDa Protein Activator II, Hsp70 Chemical Co-Chaperone II, YM-08, YM08, YM8
DescriptionA cell-permeable, neutrally charged, pyridinium-to-pyridine substituted YM-01 (Cat. No. 500615) and MKT-077 structural analog that exhibits higher HSP70-binding affinity than its cationic pyridinium counterparts (IC50 = 0.61 µM/YM-08, 3.2 µM/YM-01, and 6.4 µM/MKT-077, respectively, in competitive binding assays using human Hsc70/HSPA8), but reduced tau degradation-promoting potency in cultures (% degradation of p-tau/total tau/24 h = 42/64, 88/89, and 81/80 in HeLaC3 with 30 µM YM-08, MKT-077, or YM-01, respectively) and weaker anti-cancer activity (IC50 against MDA-MB-231/MCF10A/MCF7 in µM = 1.4/3.0/2,2/MKT-077, 2.0/3.3/5.2/YM-01, and 8.5/7.8/10.5/YM-08 with 72 h compound treatment). However, only YM-08, but not YM-01 or MKT-077, exhibits detectable blood-brain-barrier permeability in mice (Cmax = 4 µg/g; t1/2 = 6.8 h; AUCinf = 260 ng·h/g; 6.6 mg/kg via i.v.; 100 µL/mouse in 30% H2O/5% Cremophor/5% EtOH/60% PBS) with much reduced accumulation in kidney in vivo.
FormOrange solid
Intert gas (Yes/No) Packaged under inert gas
Chemical formulaC₁₉H₁₇N₃OS₂
Structure formulaStructure formula
Purity≥99% by HPLC
SolubilityDMSO (50 mg/ml)
Storage +2°C to +8°C
Protect from light
Do Not Freeze Ok to freeze
Special InstructionsFollowing reconstitution, aliquot and freeze (-20°C). Stock solutions are stable for up to 3 months at -20°C.
Toxicity Standard Handling
ReferencesMiyata, Y., et al. 2013. ACS Chem. Neurosci. 4, 930.

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Life Science Research > Inhibitors and Biochemicals > Small Molecules & Inhibitors > Other Inhibitors of Biological Interest > Heat Shock Protein Inhibitors