4-Isoxazolidinol,2-[[1,2,3,4-tetrahydro-6-(imidazo[1,2-a]pyridin-3-ylmethyl)-3-methyl-1-(2-methylpropyl)-2,4-dioxothieno[2,3-d]pyrimidin-5-yl]carbonyl]-, (4S)-
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