You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2S,3R,4R,5S)-5-(6-aminopurin-9-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-N-[(2R)-1-methoxy-4-methyl-1-oxopentan-2-yl]phosphonamidic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H27N6O8P
assistant