You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (3R,4R,5S)-4-acetamido-5-amino-3-[(2S,4R)-4-ethoxy-2-(ethoxymethyl)pyrrolidin-1-yl]cyclohexene-1-carboxylic acid .
user
C18H31N3O5
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