You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 9-[(2R,4S,5R)-4-hydroxy-5-(hydroxymethyl)oxolan-2-yl]-6-methoxy-3H-pyrimido[4,5-b]indol-4-one ?
user
C16H17N3O5
assistant