Tetramethylcurcumin (FLLL31), derived from curcumin, specifically suppresses the phosphorylation of STAT3 by binding selectively to Janus kinase 2 and the STAT3 Src homology-2 domain. Tetramethylcurcumin exhibits anti-inflammatory and anti-cancer effects[1][2].

[1]. Lin L, et al. Novel STAT3 phosphorylation inhibitors exhibit potent growth-suppressive activity in pancreatic and breast cancer cells. Cancer Res. 2010 Mar 15;70(6):2445-54. [2]. Yuan S, et al. FLLL31, a derivative of curcumin, attenuates airway inflammation in a multi-allergen challenged mouse model. Int Immunopharmacol. 2014 Jul;21(1):128-36.