You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-[[4-cyclohexyl-5-(furan-2-yl)-1,2,4-triazol-3-yl]sulfanylmethyl]-3-methyl-[1,3]thiazolo[3,2-a]pyrimidin-5-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H21N5O2S2
assistant