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(6R,7R,8R,9R)-9-(bromomethyl)-7-fluoro-8-((4-methoxyphenyl)diphenylmethoxy)-7,8,9,10-tetrahydro-2H,6H-6,9-epoxypyrimido[2,1-b][1,3]oxazocin-2-one
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(6R,7R,8R,9R)-9-(chloromethyl)-7-fluoro-8-((4-methoxyphenyl)diphenylmethoxy)-7,8,9,10-tetrahydro-2H,6H-6,9-epoxypyrimido[2,1-b][1,3]oxazocin-2-one
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