You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule N-(4-acetamidophenyl)-2-[(3R)-2-oxo-7-phenyl-1,3-dihydroimidazo[1,2-b]pyrazol-3-yl]acetamide .
user
C21H19N5O3
assistant