You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[[[4-(3-chlorophenyl)piperazin-1-yl]-(ethylamino)methylidene]amino]-N-cyclopropylacetamide;hydroiodide into its molecular formula.
user
C18H27ClIN5O
assistant