1H,8H-3a,9b-Epoxyoxireno[2,3]dinaphtho[1,8-bc:1',8'-fg][1,5]dioxocin-1,8-dione,2,3,8a,9a-tetrahydro-7-hydroxy-3-methoxy-, [3R-(3a,3aa,8ab,9ab,9ba)]-; Preussomerin I
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