2196244-90-1

5-[2-ethoxy-5-[(4-propyl-1-piperazinyl)thioxomethyl]phenyl]-1,6-dihydro-1-methyl-3-propyl-7H-Pyrazolo[4,3-d]pyrimidine-7-thione, also known as Dithiopropylcarbodenafil, is an impurity of Sildenafil (S435001), an orally active selective type 5 cGMP phosphodiesterase inhibitor. Dithiopropylcarbodenafil was first reported by Yun et al. in 2018.