1,6-Dioxaspiro(4.5)decane-7-butyric acid, 2-(5-ethyltetrahydro-5-(tetrahydro-3-methyl-5-(tetrahydro-6-hydroxy-6-(hydroxymethyl)-3,5-dimethyl-2H-pyran-2-yl)-2-furyl)-2-furyl)-9-hydroxy-beta-methoxy-alpha,gamma,2,8-tetramethyl-, Monosodium Salt