Beta-Hydroxyisovalerylshikonin is an inhibitor of protein-tyrosine kinases such as v-Src and EGFR, and has been shown to induce apoptosis in several human tumor cell lines. Beta-Hydroxyisovalerylshikonin significantly decreased viability of HCT116 cells (IC50 values = 30.9 μg/mL).

R162 is an effective glutamate dehydrogenase 1 (GDH1) inhibitor.

PD 089828 is a competitive inhibitor of the receptor tyrosine kinases FGFR1, PDGFRβ, and EGFR (IC50s = 0.15, 1.76, and 5.47 μM, respectively) and a noncompetitive inhibitor of the nonreceptor tyrosine kinase c-Src (IC50 = 0.18 μM)