methyl (1'S,5'R,6'S,6a'R,9'R,10'S,10a'S)-6'-(((tert-butyldimethylsilyl)oxy)methyl)-9'-hydroxy-10'-(hydroxymethyl)-10a'-(((2-(trimethylsilyl)ethoxy)methoxy)methyl)octahydro-1'H-spiro[cyclohexane-1,3'-[1,5]methanobenzo[e][1,3]dioxocine]-6'-carboxylate