You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(1R,2S)-2-[[(3R)-1-(6-methyl-5-nitropyridin-2-yl)piperidin-3-yl]methyl]cyclohexyl]-3-phenylurea The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H33N5O3
assistant