You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 1H-indol-2-yl-[3-[(3-thiophen-3-yl-1,2,4-oxadiazol-5-yl)methyl]piperidin-1-yl]methanone ?
user
C21H20N4O2S
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