4H-1-Benzopyran-4-one, 2-(1a,2,3,3a,8b,8c-hexahydro-6-hydroxy-1,1,3a-trimethyl-1H-4-oxabenzo(f)cyclobut(cd)inden-7-yl)-2,3-dihydro-5,7-dihydroxy- 67172-84-3 Kuwanon D