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 [(2R,3R,4R,5R)-2-[6-chloro-8-[(4-chlorophenyl)methylsulfanyl]purin-9-yl]-4-hydroxy-5-(hydroxymethyl)oxolan-3-yl] acetate ?
user
C19H18Cl2N4O5S
assistant