You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-amino-9-[(2R,3R,5S)-3-hydroxy-5-(hydroxymethyl)oxolan-2-yl]-7-prop-2-ynylpurin-8-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C13H15N5O4
assistant