(5R,5aR,8aR,9R)-5,8,8a,9-Tetrahydro-9-hydroxy-5-(3,4,5-trimethoxyphenyl)-furo(3',4':6,7)naphtho[2,3-d]-1,3-dioxol-6(5aH)-one

2-Oxo-(2H)-furo(2,3-h)-1-benzopyran