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 sodium;[4-(4-hydroxy-6-methyl-2-oxopyran-3-yl)-3-(3-methylphenyl)-2-oxo-1,3-diazinan-1-yl]methanesulfonate ?
user
C18H19N2NaO7S
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