You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[2-[[6-amino-9-[(2R,3R,4S,5R)-5-(ethylaminomethyl)-3,4-dihydroxyoxolan-2-yl]purin-2-yl]amino]ethyl]-7-methylsulfonylheptanamide by IUPAC nomenclature, provide its molecular formula.
user
C22H38N8O6S
assistant