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(2S,4Ar,10aS)-2',10-diamino-2-iminospiro[4a,6,8,9,10,10a-hexahydro-4H-[1,3,2]dioxaphosphinino[4,5-g][1,3]oxazocin-7-ium-7,1'-pyrimidin-1-ium]-4'-one


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