You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R,3R,4R,5S)-5-(4,6-dimethyl-6,7-dihydroimidazo[2,1-f][1,2,4]triazin-7-yl)-4-fluoro-2-(hydroxymethyl)oxolan-3-ol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C12H17FN4O3
assistant