You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(6-methylpyridazin-3-yl)-5-(5-pyrrolidin-2-ylthiophen-2-yl)-1,2,4-oxadiazole is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H15N5OS
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