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-(4-fluorophenyl)-5-(2-methoxypyridin-4-yl)-2-[(3R)-3-methylpiperazin-1-yl]imidazo[2,1-b][1,3,4]thiadiazole ?
user
C21H21FN6OS
assistant