You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-amino-4,6-dimethyl-N-(5-methyl-3-oxo-2-phenyl-1H-pyrazol-4-yl)thieno[2,3-b]pyridine-2-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C20H19N5O2S
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