15,17-Dimethoxytricyclo(11.3.1.1(5,9))octadeca-1(17),5,8,13,15-pentaene-7,18-dione;15,17-Dimethoxytricyclo[11.3.1.1~5,9~]octadeca-1(17),5,8,13,15-pentaene-7,18-dione
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