Involved in the production of blood-red nectar containing the alkaloid nesocodin and that serves as a visual attractant for pollinator visitation, including vertebrates such as Phelsuma geckos (PubMed:35074876). The nectar is initially acidic and pale yellow, but slowly becomes alkaline before turning into red within 24 hours (PubMed:35074876). Together with NEC1 and NEC3, facilitates the condensation of sinapaldehyde ((E)-3,5-dimethoxy-4-hydroxycinnamaldehyde) and proline to form nesocodin, a pigment with a stable imine bond (PubMed:35074876). Protects nesocodin from degradation by hydrogen peroxide H(2)O(2) by catalyzing the degradation of H(2)O(2) into water H(2)O and dioxygene O(2) (PubMed:35074876). 2 H2O2 = 2 H2O + O2 Forms homomultimers. Observed in all flowers organs; mainly expressed in nectaries and, to a lower extent, in petals and ovules, as well as in stigmas and calyx at low levels.