8α-hydroxy-11α,13-dihydrozaluzanin C

In the structure of the title compound [3a,4,5,6,6a,7,8,9,-9a,9b-decahydro-4,8-dihydroxy-3-methyl-6,9-bis(methyl-ene)azuleno[4,5-b]furan-2(3H)-one, C 15 H 20 O 4 ], the secondary hydroxyl groups participate in intermolecular hydrogen bonds both as donors and acceptors.