′؛ - التونانـوا

1,1′-Thiocarbonyldiimidazole, also known as TCDI, is a chemical compound with the molecular formula C9H8N4S. It is a white crystalline solid that is soluble in organic solvents such as chloroform and dichloromethane.

TCDI is a versatile reagent that is commonly used in organic synthesis as a coupling agent for peptide synthesis and as a carbodiimide for amide bond formation. It can also be used as a reagent for the modification of proteins, nucleic acids, and carbohydrates.