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  • (E)-2-((6R,7S)-6-ethynyl-6,7-dihydroxy-1-(4-methoxybenzyl)-2-oxo-1,4,6,7-tetrahydro-2H,5H-spiro[benzo[d][1,3]oxazine-8,2'-[1,3]dioxolan]-5-ylidene)acetonitrile

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