Ethanone,1,1'-(6,6a-dihydro-1,1',7',10',11-pentahydroxy-6a-methylspiro[5H-[1]benzopyrano[4,5-bc][1]benzopyran-5,6'-[6H]dibenzo[b,d]pyran]-2',10-diyl)bis-,(5R-trans)-; (+)-Cynandione B; Cynandione B
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