5-[[5-[[5-[(5-hydroxy-3,4-dimethylpyrrolidin-2-yl)methyl]-3-(3-hydroxy-3-methoxypropyl)-4-methylpyrrolidin-2-yl]methyl]-3-methyl-4-propylpyrrolidin-2-yl]methyl]-3,4-dimethylpyrrolidin-2-ol