You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 6-chloro-2-(1-chloroethyl)-3-[(2,2,3,3-tetramethylcyclopropyl)methyl]imidazo[4,5-b]pyridine ?
user
C16H21Cl2N3
assistant