Lucidenic acid O is a terpene compound, is a DNA polymerases inhibitor. Lucidenic lactone inhibits calf DNA polymerase-α, rat DNA polymerase-β, and HIV-1 reverse transcriptase with IC50 values of 42 μM, 99 μM, and 69 μM, respectively.

8-epi-Helenalin is a semitterpene lactone with anti-tumor activity that can be isolated from Inula britannicaL. var. chinensis (Rupr.) Reg. and the ED50 values of 8-epi-Helenalin for HL-60, A549, MCF7, HCT-15, SK-OV-3 and Malme-3M are 12.2 μM, 53.8 μM, 9.1 μM, 8.7 μM, 18.7 μM and 8.3 μM, respectively. 8-epi-Helenalin can be used for anti-tumor studies.

SH2 Domain Ligand (3)