You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2R,3R,4S,5R)-2-[[4-[[(1R,2R,4S)-2-bicyclo[2.2.1]heptanyl]amino]-6-[ethyl(methyl)amino]-1,3,5-triazin-2-yl]amino]-5-(hydroxymethyl)oxolane-3,4-diol by IUPAC nomenclature, provide its molecular formula.
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C18H30N6O4
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