Piceatannol (Astringenin) is an anti-inflammatory, immunomodulatory and antiproliferative agent. It inhibits p56lck and syk protein tyrosine kinases and inhibits NF-κB activation and gene expression of TNF-induced. It is synthetic from the conversion of resveratrol by cytochrome P450 1B1.

Cerdulatinib hydrochloride (PRT2070 hydrochloride) is an oral active, multi-targeted tyrosine kinase inhibitor with IC50 of 12 nM/6 nM/8 nM/0.5 nM and 32 nM for JAK1/JAK2/JAK3/TYK2 and Syk, respectively. Also inhibits 19 other tested kinases with IC50 less than 200 nM.

TC-S 7003 (Lck Inhibitor) is an orally active, selective and potent lymphocyte kinase (Lck) inhibitor with anti-inflammatory activity, inhibition of Lck, Lyn, Src, and Syk kinases, and inhibition of T-cell proliferation, and may be useful in the study of arthritis.

R406 free base (R406 (free base)) is a potent Syk inhibitor.

Ellagic acid (Gallogen), a thickened tetracyclic natural product, is a potent CK2 inhibitor (IC50=40 nM; Ki=20 nM) with ATP-competitive properties. Ellagic acid is an antioxidant and also possesses antiproliferative activity.

Fostamatinib (R788)(IC50 of 41 nM), which is a prodrug of the active metabolite R406, is a Syk inhibitor. It does not work on Lyn.

R112 is an ATP-competitive inhibitor of Syk kinase. Ki=6 nM,IC50=226 nM.

Syk-IN-3 is a Syk inhibitor with potential anti-inflammatory and anticancer activity and can be used to study immune dysregulation.