You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-(3,4-dimethoxyphenyl)-4-methyl-1,3-thiazol-5-yl]-(1-phenyl-3,4-dihydro-1H-pyrrolo[1,2-a]pyrazin-2-yl)methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H25N3O3S
assistant