You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-(4-chlorophenyl)-3-[2-methyl-1-(2-morpholin-4-ium-4-ylethyl)benzimidazol-5-yl]thieno[3,2-d]pyrimidin-4-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H25ClN5O2S+
assistant