You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S,2R,4S)-4-(4-aminopyrrolo[2,3-d]pyrimidin-7-yl)-2-(hydroxymethyl)-3-methylidenecyclopentan-1-ol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H16N4O2
assistant