You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2,5-dichloro-N-[(2R)-4-[5-methyl-4-nitro-1-[(3R)-oxolan-3-yl]pyrazol-3-yl]oxybutan-2-yl]pyrimidin-4-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H20Cl2N6O4
assistant