(1R,3S)-9-Methoxy-1,3-dimethyl-3,4-dihydro-1H-benzo[g]isochromene-5,10-dione;1H-naphtho[2,3-c]pyran-5,10-dione, 3,4-dihydro-9-methoxy-1,3-dimethyl-, (1R,3S)-
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