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-methylpentacyclo[10.7.1.02,7.08,20.014,19]icosa-1(20),2(7),3,5,8,10,12,14(19),17-nonaene ?
user
C21H15Cl
assistant