You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule [6-(2,4-dihydroxyphenyl)-3-ethyl-4-methyl-2-sulfanylidene-1,6-dihydropyrimidin-5-yl]-phenylmethanone ?
user
C20H20N2O3S
assistant