You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by [(3R)-3-[[(2S)-2-amino-3-methylbutanoyl]oxymethyl]-4-(2-amino-6-oxo-1H-purin-9-yl)butyl] octadecanoate ?
user
C33H58N6O5
assistant