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 2-(4-oxo-5-propylpyridazino[4,5-b]indol-3-yl)-N-[(2R)-4-phenylbutan-2-yl]acetamide .
user
C25H28N4O2
assistant