Prosolanapyrone-III cycloisomerase (EC 5.5.1.20, Sol5, SPS, solanapyrone synthase (bifunctional enzyme: prosolanapyrone II oxidase/prosolanapyrone III cyclosiomerase)) is an enzyme with systematic name prosolanapyrone-III:(-)-solanapyrone A isomerase. This enzyme catalyses the following chemical reaction Prosolanapyrone-III cycloisomerase (EC 5.5.1.20, Sol5, SPS, solanapyrone synthase (bifunctional enzyme: prosolanapyrone II oxidase/prosolanapyrone III cyclosiomerase)) is an enzyme with systematic name prosolanapyrone-III:(-)-solanapyrone A isomerase. This enzyme catalyses the following chemical reaction