You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-acetamido-N-[(3-cyclopropyl-1,2,4-oxadiazol-5-yl)methyl]-3-(1H-indol-3-yl)propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H21N5O3
assistant