You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-butan-2-yl-N-[3-[[5-(4-chlorophenyl)-1,3,4-thiadiazol-2-yl]amino]-3-oxopropyl]cyclopropanecarboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H23ClN4O2S
assistant