You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 4-[(3S,4R,6R)-6-butyl-4-(2-nitropropan-2-yl)-3-prop-2-enyl-2-sulfanylidenepiperidin-1-yl]butan-2-one ?
user
C19H32N2O3S
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