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Isocryptotanshinone is a potent signal transducer and activator of transcription 3 (STAT3) and protein tyrosine phosphatase 1B PTP1B inhibitor, with an IC50 of 56.1 μM for PTP1B.

Product information

CAS Number: 22550-15-8

Molecular Weight: 296.36

Formula: C19H20O3

Chemical Name: (8S)-4, 4, 8-trimethyl-1H, 2H, 3H, 4H, 7H, 8H, 9H, 11H-phenanthro[3, 2-b]furan-7, 11-dione

Smiles: C[C@@H]1COC2=C1C(=O)C1C=CC3=C(CCCC3(C)C)C=1C2=O


InChi: InChI=1S/C19H20O3/c1-10-9-22-18-14(10)16(20)12-6-7-13-11(15(12)17(18)21)5-4-8-19(13,2)3/h6-7,10H,4-5,8-9H2,1-3H3/t10-/m1/s1

Technical Data

Appearance: Solid Power

Purity: ≥98% (or refer to the Certificate of Analysis)

Solubility: Soluble in DMSO

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical or refer to Certificate of Analysis

Storage Condition: Dry, dark and -20 oC for 1 year or refer to the Certificate of Analysis.

Shelf Life: ≥12 months if stored properly.

Stock Solution Storage: 0 - 4 oC for 1 month or refer to the Certificate of Analysis.

Drug Formulation: To be determined

HS Tariff Code: 382200

How to use

In Vitro:

It is showed that tanshinones significantly inhibited A549 proliferation and Isocryptotanshinone (ICTS) exhibits the strongest activity. Isocryptotanshinone inhibits the constitutive STAT3 and p-STAT3 (Y705) expression in concentration and time-dependent manners. Isocryptotanshinone dramatically inhibits the IL-6-stimulated expression of p-STAT3 (Y705) in a time-dependent manner.


  1. Guo S, et al. Isocryptotanshinone, a STAT3 inhibitor, induces apoptosis and pro-death autophagy in A549 lung cancer cells. J Drug Target. 2016 Dec;24(10):934-942.
  2. Han YM, et al. PTP1B inhibitory effect of abietane diterpenes isolated from Salvia miltiorrhiza. Biol Pharm Bull. 2005 Sep;28(9):1795-7.

Products are for research use only. Not for human use.


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