You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2R,3R)-2-ethyloxan-3-yl]-[4-(4-methoxypyrimidin-2-yl)piperazin-1-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H26N4O3
assistant