Spiro[1,3-dioxolane-2,4'(5'H)-[3,5a]methano[5aH]cyclohept[a]oxireno[g]naphthalene](8CI); Spiro[1,3-dioxolane-2,12'-[1H-2,10a]ethanophenanthrene], 6',7'-epoxy-
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