You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[(2R)-2-hydroxy-3-phenoxypropyl]sulfanyl-3-methyl-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-4-one by IUPAC nomenclature, provide its molecular formula.
user
C20H22N2O3S2
assistant