You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-amino-7-[3-hydroxy-5-(hydroxymethyl)-5-methyloxolan-2-yl]pyrrolo[2,1-f][1,2,4]triazine-5-carbonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H15N5O3
assistant