Longhu Pharmaceutical Factory, in the laboratory.
Li Yuan, wearing a mask and gloves, calmly controls the test tube in his hand.
Sildenafil can be divided into three parts in terms of molecular structure: sulfonamide, 2,4-substituted phenethyl ether, and heterocycle.
Therefore, all the synthesis routes are designed from these three units.
However, even if there was a complete drug manual, Li Yuan even specialized in pharmacy for three years, but it took him fifteen years from starting to develop this man's holy drug to really master the commercial integration route.
Process development of the original drug