[5R-[5Alpha,5a beta,8a alpha, 9beta(R*)]]-5,8,8a,9-tetrahydro-5-(4-hydroxy-3,5-dimethoxyphenyl)-9-[[4,6-O-(2-thienylmethylene)-beta-D-glucopyranosyl]oxy]furo[3',4':6,7]-naphtho[2,3-d]-1,3-dioxol-6(5aH)-one