You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance [(2S,4R,5R)-5-(4-aminopyrrolo[2,1-f][1,2,4]triazin-7-yl)-5-cyano-4-hydroxyoxolan-2-yl]methoxy-hydroxy-oxophosphanium .
user
C12H13N5O5P+
assistant