Squalestatin 3 is a secondary metabolite, which can be isolated from Phoma. Squalestatin 3 is an inhibitor for squalene synthase with an IC50 of 6 nM[1].
References
[1] Watson N S, et al. The squalestatins: potent inhibitors of squalene synthase. The role of the tricarboxylic acid moiety[J]. Bioorganic & Medicinal Chemistry Letters, 1993, 3(12): 2541-2546.
