Residue-formed organosulfur molecules (CHNOS) are more unsaturated than ice-formed ones. The DBE-#C plot illustrates that organosulfur (CHNOS) compounds formed by S⁷⁺-over-irradiated residues are enriched in carbon number and double bond equivalent (DBE) CHNOS molecules formed inside S⁷⁺ -irradiated ices (black). For reference, characteristics of PAHs (polycyclic aromatic hydrocarbons, dashed line) are indicated.