You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 4-[[4-cyclopropylimino-2-[[3-(dimethylamino)phenyl]methylamino]pyrazolo[1,5-a][1,3,5]triazin-8-ylidene]methyl]-5-hydroxy-1,3-dihydroimidazol-2-one ?
user
C21H23N9O2
assistant