You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named (3R)-1-(4-chlorophenyl)-3-(2,3-dihydro-1,4-benzodioxin-6-yl)-2,5,6,7-tetrahydroimidazo[2,1-b][1,3]thiazin-4-ium-3-ol is given. What is its corresponding molecular formula?
user
C20H20ClN2O3S+
assistant