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system
Provide the molecular formula for the IUPAC named substance 2-[(5E)-5-[(2E)-2-(1-ethylquinolin-4-ylidene)ethylidene]-4-oxo-2-sulfanylidene-1,3-thiazolidin-3-yl]ethyl dihydrogen phosphate .
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C18H19N2O5PS2
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