You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (2E)-5-[[6-[4-(butylamino)butoxy]-5-methylpyrimidin-4-yl]amino]-4-chloro-2-ethylidenehex-5-enenitrile;ethane into molecular formula.
user
C23H38ClN5O
assistant