You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule N-[3-[[[ethylamino-[(3-propan-2-yl-1,2-oxazol-5-yl)methylamino]methylidene]amino]methyl]phenyl]butanamide .
user
C21H31N5O2
assistant