(+)-Glaucarubinone is a potent AP-1 (activator protein-1) inhibitor with an EC50 value of 0.13 µM. (+)-Glaucarubinone shows noncytotoxic.
References:
[1]. Diyabalanage T, et al. Nothospondin, a new AP-1 inhibitory quassinoid from the Cameroonian plant Nothospondias staudtii. Bioorg Med Chem Lett. 2011 Aug 1;21(15):4397-9.