You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[[(1S,5S,6R,7R)-3-(5-ethylpyrimidin-2-yl)-10-oxa-3-azatricyclo[5.2.1.01,5]decan-6-yl]methyl]-2-methyl-1H-imidazole-5-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H26N6O2
assistant