Rimmer et al. applied kinetics and timescales to predict where UV-driven cyanosulfidic chemistry 58 (see Fig. ) can take place. They investigated the production of simple sugars from hydrogen cyanide and sulfite, and from glycolonitrile and sulfide. At each of these steps, the chemistry can form inert adducts without UV light (dark chemistry) and precursors to sugars in the presence of UV light (light chemistry). They were able to determine a threshold UV spectral irradiance such that the light chemistry out-competes the dark chemistry, meeting the requirements of high yield and selectivity (see Figure ). They then compared this threshold UV spectral irradiance to the UV spectral irradiance for various stars, at distances from those stars where the total flux of the star is equivalent to the flux received at the Earth from the Sun. This delineates an "Abiogenesis Zone" outside of which the cyanosulfidic scenario cannot succeed, if using sulfite as the source for solvated electrons.