You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 7-[5-[(4S)-4-aminospiro[4,6-dihydropyrrolo[1,2-b]pyrazole-5,4'-piperidine]-1'-yl]pyrazin-2-yl]sulfanyl-8-chloroimidazo[1,2-a]pyridine-2-carbonitrile is given. What is its corresponding molecular formula?
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C22H20ClN9S
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