|Jmol-3D images||Image 1|
|Molar mass||336.38 g mol−1|
|Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)|
|(what is: / ?)|
Cyclopiazonic acid (CPA) is a toxic fungal secondary metabolite. Chemically, it is an indole tetramic acid. CPA was originally isolated from Penicillium cyclopium and subsequently from other fungi including Penicillium griseofulvum, Penicillium camemberti, Aspergillus flavus, and Aspergillus versicolor. CPA only appears to be toxic in high concentrations. Biologically, CPA is a specific inhibitor of Ca2+-ATPase in the intracellular Ca2+ storage sites.