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 (3aR,4R,6S,6aS)-4-(6-aminopurin-9-yl)-2,2-dimethyl-N-(4-methylcyclohexyl)-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxole-6-carboxamide ?
user
C20H28N6O4
assistant