The molecule is an acyl-CoA that results from the formal condensation of the thiol group of coenzyme A with the 1-carboxy group of 4-carboxy-2-thioxobutanoic acid. It is a conjugate acid of a 4-carboxylato-2-thioxobutanoyl-CoA(5-). It is a tautomer of a (2Z)-4-carboxy-2-sulfanylbut-2-enoyl-CoA.
5-[2-[3-[[4-[[[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-4-hydroxy-3-phosphonooxyoxolan-2-yl]methoxy-hydroxyphosphoryl]oxy-hydroxyphosphoryl]oxy-2-hydroxy-3,3-dimethylbutanoyl]amino]propanoylamino]ethylsulfanyl]-5-oxo-4-sulfanylidenepentanoic acid