You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 3,5-diamino-6-chloro-N-[N'-[4-[4-(2-hydroxybutoxy)phenyl]butyl]carbamimidoyl]pyrazine-2-carboxamide .
user
C20H28ClN7O3
assistant