dimethyl (-)-(2aR,3R,4R,4aS,5R,7aS,8R,10S,10aR)-3,8,10-trihydroxy-4-((2R,6R)-2-hydroxy-11-methyl-5,7,10-trioxatetracyclo(6.3.1.0(2,6)0(9,11)dodec-3-en-9-yl)-4-methylperhydroisobenzofurano(5,4,3a-cd)isobenzofuran-5,10a-diacetate)