Four Polymorphs of Bioactive Diuretic Drug 4-Chloro-5-Chlorosulfonylsalicylic Acid

4-Chloro-5-chlorosulfonylsalicylic acid [C7H4Cl2O5S] is a derivative of salicylic acid and a diuretic agent. Its ability to form polymorphs through recrystallization from various solvents was demonstrated. As a result, four polymorphs were successfully obtained and analyzed using single-crystal X-ray diffraction and powder X-ray diffraction. The solid-state properties were investigated by evaluating crystal lattice energies and intermolecular interactions.