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 [4-acetyl-5-[2-(2,2-dimethylpropanoylamino)-4-oxo-3H-pteridin-6-yl]-1,3-dithiol-2-yl]-tributylphosphanium .
user
C28H43N5O3PS2+
assistant