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 6-chloro-5-cyano-4-[[4-[[1-(hydroxymethyl)cyclopropyl]amino]-1-methyl-2-oxoquinolin-6-yl]amino]pyridine-2-carboxylic acid ?
user
C21H18ClN5O4
assistant