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Methyl (1S,5S,6R,10S,11S,13R,16S)-16-[bis[bis(phosphanyl)phosphanyl]phosphanyl-[bis(phosphanyl)phosphanyl-phosphanylphosphanyl]phosphanyl]oxy-13-[bis(phosphanyl)phosphanyl-[bis(phosphanyl)phosphanyl-(diphosphanyl)phosphanyl]phosphanyl]oxy-7,10-dihydroxy-1


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