sodium 4-[2-[5-[5-[6-[(4-bromophenyl)carbamoyloxymethyl]-6-hydroxy-3,5 -dimethyl-oxan-2-yl]-3-methyl-oxolan-2-yl]-5-ethyl-oxolan-2-yl]-9-hydr oxy-2,8-dimethyl-1,6-dioxaspiro[4.5]dec-7-yl]-3-methoxy-2-methyl-penta noate