You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[6-(6-chloro-1,3-benzoxazol-2-yl)pyridazin-3-yl] N-methyl-N-[(1R,3S)-3-(propanoylamino)cyclopentyl]carbamate is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H22ClN5O4
assistant