(1R,3S,4R,5S,6S,7R,8S)-4-chloromethyl-3,4-diyhdroxy- 8-(4-hydroxymethacrylate)-1H,5H,6H,7H-guaia-10(14),11(13)-dien-6,12-olide,

C₁₉H₂₃ClO₇

Mattern, G.Weckert, E.Youssef, D.Frahm, A. W.

Acta Crystallographica Section C (1996) 52, 7 1791-1793

a=8.193(5)Å   b=10.546(6)Å   c=11.092(6)Å

α=90.0°   β=103.21(4)°   γ=90.0°