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(1R,2E,6S,10E,11aS,13S,14aR)-1,6,7,8,9,11a,12,13,14,14a-decahydro-1-hydroxy-13-methoxy-6-methyl-4H-cyclopent[f]oxacyclotridecin-4-one
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(2E,6R*,10E,11aR*,13R*,14aS*)-13-methoxy-6-methyl-7,8,9,11a,12,13,14,14a-octahydro-4H-cyclopent[f]oxacyclotridecin-1,4-(6H)-dione