First, 4.7 g of PVPVA and 1.8 g of ascorbic acid were added and dissolved in 160 g of PEG 400. Then, 25 mg of S-892216 anhydrous crystal was dissolved in 9618.8 mg of the PEG 400 solution. Finally, 5.0 g of drug-containing solution and 4.3 g of PG were mixed using a stirrer to obtain the oral solution.