You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(1R)-1-[4-(5-ethyl-1,3-thiazol-2-yl)piperazin-1-yl]ethyl]-5-methyl-1,3,4-oxadiazole is the IUPAC name of a molecule. Please give its molecular formula.
user
C14H21N5OS
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