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 (2-benzyl-1,3-thiazol-4-yl)-(1-methyl-3-pyridin-4-yl-6,8-dihydro-5H-imidazo[1,5-a]pyrazin-7-yl)methanone .
user
C23H21N5OS
assistant