You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2R,4R,8S,9S,11S,12R,13S)-8-(2-chloroacetyl)-12-fluoro-11-hydroxy-1,6,6,9,13-pentamethyl-5,7-dioxapentacyclo[10.8.0.02,9.04,8.013,18]icos-17-en-16-one by IUPAC nomenclature, provide its molecular formula.
user
C25H34ClFO5
assistant