10,13,19-trihdroxy-4,4,7,12a,16,21a-hexamethyl-1,4,5,5a,7a,12a,13,14,14a,15,18- dodecahydrodicyclohepta[e:e']cycloundeca[1.2-b;5,6-b]dipyran-9,18-dione

C₃₃H₄₀O₇

Gao, Q.Mayerl, F.

Acta Crystallographica Section C (1994) 50, 12 2033-2036

a=11.5190(10)Å   b=15.6000(10)Å   c=32.258(2)Å

α=90.°   β=90.°   γ=90.°