You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-ethyl-6-[(2R,3S,4R,6S)-3-hydroxy-4,6-dimethyl-5-oxo-7-tri(propan-2-yl)silyloxyheptan-2-yl]-3,5-dimethylpyran-4-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H48O5Si
assistant