You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1R,2S,5S,8S,9R,12S,17R,18R,21S,24R,26S,27S)-5,12-dihydroxy-2,9,26-trimethyl-3,19,23,28-tetraoxaoctacyclo[16.9.1.118,27.01,5.02,24.08,17.09,14.021,26]nonacosa-13,15-diene-4,10,22,29-tetrone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H30O10
assistant