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 lithium;(2S)-1-[[6-[[(2S)-2-methoxycarbonylpyrrolidin-1-yl]methyl]pyridin-2-yl]methyl]pyrrolidine-2-carboxylate ?
user
C18H24LiN3O4
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