You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name (S)-[(3aS,4R,6R,6aR)-4-(4-chloropyrrolo[2,3-d]pyrimidin-7-yl)-2,2-dimethyl-4,5,6,6a-tetrahydro-3aH-cyclopenta[d][1,3]dioxol-6-yl]-(3,4-dichlorophenyl)methanol ?
user
C21H20Cl3N3O3
assistant