You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
furan-2-yl-[4-[(1S)-1-[5-(4-nitrophenyl)-1,3,4-oxadiazol-2-yl]ethyl]piperazin-1-yl]methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H19N5O5
assistant