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(6R,10S,11S,14R,15R)-15-[(2R,3R,4R,5R,6S)-6-Ethyl-4,5-dihydroxy-3-(methylamino)oxan-2-yl]oxy-6-hydroxy-7'-methoxy-5'-methyl-6-[(4S)-2-oxo-1,3-dioxolan-4-yl]spiro[13-oxatetracyclo[7.6.0.03,7.010,14]pentadeca-1(9),2,4,7-tetraene-11,1'-naphthalene]-2',12-dio


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