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 2-(3-butyl-2,4-dioxo-4aH-thieno[3,2-d]pyrimidin-1-ium-1-yl)-N-[3-(trifluoromethyl)phenyl]acetamide .
user
C19H19F3N3O3S+
assistant