Abstract: | The δ polymorph of sulfanilamide (or 4‐aminobenzenesulfonamide), C6H8N2O2S, displays an overall three‐dimensional hydrogen‐bonded network that is dominated by a two‐dimensional substructure with R22(8) rings; these result from dimeric N—H...O interactions between adjacent sulfonamide groups. This study shows how the polymorphism of sulfanilamide is linked to its versatile hydrogen‐bonding capabilities. |