(2S,5R,10S,11R)-5-(benzyloxy)-2-hydroxy-12-((4-methoxybenzyl)oxy)-11-methyl-10-((triethylsilyl)oxy)-1-((R)-2,2,4-trimethyl-1,3-dioxolan-4-yl)dodec-7-yn-6-one

(2S,6R,8S,11R)-11-(benzyloxy)-2-((R)-1-((4-methoxybenzyl)oxy)propan-2-yl)-4-methyl-8-(((R)-2,2,4-trimethyl-1,3-dioxolan-4-yl)methyl)-1,7-dioxaspiro[5.5]undec-4-ene