6,12-Epoxy-6H-dibenz(b,f)oxocin-1-carboxaldehyde, 11,12-dihydro-4,7,8-trihydroxy-3,9-dimethoxy-6,12-dimethyl-11-oxo-;6,12-Epoxy-6H-dibenz[b,f]oxocin-1-carboxaldehyde, 11,12-dihydro-4,7,8-trihydroxy-3,9-dimethoxy-6,12-dimethyl-11-oxo-
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