4,8,12,16-Pentaoxatricosane-1,23-diol, with the molecular formula C₁₈H₃₈O₇ and a molecular weight of 366.49. Its structure consists of five 1,3-propanediol units connected in a chain via ether bonds, with a hydroxyl group at each end. Production typically involves stepwise condensation reactions, using 1,3-propanediol as the raw material, where water molecules are gradually eliminated under the action of a catalyst to form ether bonds. Due to its good hydrophilicity and biocompatibility, this product is used in the pharmaceutical field for drug modification and construction of drug delivery systems; in cosmetics, it serves as a humectant and emollient; and in industrial applications, it can also act as a basic raw material for plasticizers and anti-fogging agents.