You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [(1R,2S)-2-[[6-hydroxy-1-(3-methoxyphenyl)-4-oxo-2-sulfanylidenepyrimidin-5-yl]methylideneamino]cyclohexyl]azanium by IUPAC nomenclature, provide its molecular formula.
user
C18H23N4O3S+
assistant