You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named (2S)-2-hydroxy-N-[(2R)-2-(6-oxo-3-thiophen-2-ylpyridazin-1-yl)propyl]-2-phenylpropanamide is given. What is its corresponding molecular formula?
user
C20H21N3O3S
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