You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5Z)-3-ethyl-5-[[(4R)-1,2,2,4-tetramethyl-3,4-dihydroquinolin-6-yl]methylidene]-1,3-thiazolidine-2,4-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H24N2O2S
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