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 methyl (4S)-2-amino-1'-[(2-chlorophenyl)methyl]-7-methyl-2',5-dioxospiro[6H-pyrano[3,2-c]pyridine-4,3'-indole]-3-carboxylate ?
user
C25H20ClN3O5
assistant