You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-N-(2-aminoethyl)-2-N-ethyl-4-N-methylpyrimidine-2,4-diamine;2-hydroxysulfanyl-5-methoxy-1,3-dimethylbenzene;hydrate is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H31N5O3S
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