The network of important reactions for the carbon, sulfur, and coupled organosulfur chemistry in the atmosphere of K2-18b. Pathway B (following R. Hu et al. 2025) dominates the DMS and DMDS production, and the reactions unique to pathway B are highlighted in green. Reaction steps in pathway A (following N. W. Reed et al. 2024) that are not important in pathway B are highlighted in purple. Destruction pathways of DMS and DMDS are highlighted in gray. Unimolecular reactions are denoted with dashed lines, bimolecular reactions with solid single lines, and termolecular reactions with solid double lines.