You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule [(2R,3S,4R,5R)-3,4-dihydroxy-5-[6-[[(3R)-oxolan-3-yl]amino]purin-9-yl]oxolan-2-yl]methyl N-butylcarbamate .
user
C19H28N6O6
assistant