5-[(2S)-2-hydroxy-2-(3,4,5-trimethoxyphenyl)ethyl]-2-methoxyphenol

CA4P binds tubulin with a higher efficacy than colchicines, and was therefore initially investigated as an anti-mitotic agent. However, it was later observed to also induce vascular shutdown and necrosis in tumours. Clinical trials have revealed its positive effects, either as a single agent or in combination with chemotherapy, in patients with ovarian, lung or anaplastic thyroid cancer. Biochemical analyses revealed that CA4P rapidly diminished the tyrosine phosphorylation of VE-cadherin and beta-catenin, thereby blocking the endothelial signalling pathway that is necessary for maintaining a functional endothelial cell structure and survival.