You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule ethyl 4-[6-[2-chloroethyl-[2-(dimethyl-lambda3-iodanyl)ethyl]amino]-1-methylbenzimidazol-2-yl]butanoate ?
user
C20H31ClIN3O2
assistant