Propanoic acid, 2,2-dimethyl-, (5-oxo-3-pyrazinyl-1,2,4-oxadiazol-4(5H)-yl)methyl ester;propanoic acid, 2,2-dimethyl-, [5-oxo-3-(2-pyrazinyl)-1,2,4-oxadiazol-4(5H)-yl]methyl ester
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