You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[3-(2-aminopyrimidin-4-yl)-2-methylbenzimidazol-5-yl]-2-(1,3-thiazol-2-yl)but-3-yn-2-ol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H16N6OS
assistant