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What is the molecular formula of the compound with this IUPAC name N-[(2-chlorophenyl)methyl]-2-(4,6-dioxo-5-propyl-8-thia-5,10-diaza-3-azoniatricyclo[7.4.0.02,7]trideca-1(9),2,10,12-tetraen-3-yl)acetamide ?
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C21H20ClN4O3S+
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