You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-[2-(tert-butylamino)-2-oxoethyl]-2-[5-(4-fluorophenyl)tetrazol-2-yl]-N-[[(2R)-oxolan-2-yl]methyl]acetamide into molecular formula.
user
C20H27FN6O3
assistant