Onychocin B is a cyclic tetrapeptide originally isolated from Onychocola sclerotica that has calcium channel inhibitory activity.1 It inhibits the voltage-gated calcium (Cav) channel Cav1.2 with an IC50 value of 7.1 µM.
1.PÉrez-Victoria, I., MartÍn, J., GonzÁlez-MenÉndez, V., et al.Isolation and structural elucidation of cyclic tetrapeptides from Onychocola scleroticaJ. Nat. Prod.75(6)1210-1214(2012)
















