You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 2-[[(2S,3R,4S,5R)-5-[6-[bis[(2-methylpropan-2-yl)oxycarbonyl]amino]-2-chloropurin-9-yl]-4-fluoro-3-methyloxolan-2-yl]methoxy]-2-(naphthalen-2-ylmethyl)-3-oxobutanoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C38H45ClFN5O9
assistant