You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[[(2R)-6-bromo-2-phenyl-4H-1,3-benzodioxin-8-yl]methylsulfanyl]-5,7-dimethyl-[1,2,4]triazolo[4,3-a]pyrimidine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H19BrN4O2S
assistant