You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(3aS,4S,5S,6Z,10Z,11aR)-5-hydroxy-10-(hydroxymethyl)-3-methylidene-2-oxo-6-(2-oxoethyl)-3a,4,5,8,9,11a-hexahydrocyclodeca[b]furan-4-yl] (Z)-2-methylbut-2-enoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H26O7
assistant