You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1R,3R,6S,8R,9S,13E,16S,18R,19R,20E,22Z,26R,27S,28S)-5,14,18,27-tetramethylspiro[2,7,11,17,25,30-hexaoxahexacyclo[24.2.1.116,19.03,9.06,8.09,27]triaconta-4,13,20,22-tetraene-28,2'-oxirane]-12,24-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C29H34O9
assistant