You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-(6-methylpyrimidin-4-yl)-1,3,3a,4,6,6a-hexahydropyrrolo[3,4-c]pyrrol-5-yl]-2-(2-methyl-1,3-thiazol-5-yl)ethanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H21N5OS
assistant