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-morpholin-4-yl-1-[4-(1-phenylpyrazolo[3,4-d]pyrimidin-4-yl)piperazin-1-yl]ethanone .
user
C21H25N7O2
assistant