You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 3-acetyloxy-4-[5-formyloxy-3-(furan-3-yl)-4-(2-hydroxy-3-methylbutanoyl)oxy-3a-methyl-2-(2-methylbutanoyloxy)-7-methylidene-1a,2,3,4,5,6-hexahydroindeno[1,7a-b]oxiren-6-yl]-4-[2-(hydroxymethyl)-2-methyl-5-oxooxolan-3-yl]pentanoic acid .
user
C39H52O16
assistant