You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-amino-9-[(1R,3S,6R,10S,12S,13R,18R,21R)-11-(6-aminopurin-9-yl)-3-ethoxy-12,15-dihydroxy-21-methoxy-3-oxo-15-sulfanylidene-2,4,14,16,19-pentaoxa-3lambda5,15lambda5-diphosphatetracyclo[16.2.1.06,10.06,13]henicos-7-en-20-yl]-1H-purin-6-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H34N10O11P2S
assistant