Here is a molecule represented with SMILE: COc1cc(-c2oc3cc(O)c(OC)c(O)c3c(=O)c2OC2OC(COC3OC(CO)C(O)C(O)C3OC(=O)C=Cc3ccc(O)cc3)C(O)C(O)C2OC2OCC(O)(CO)C2O)ccc1O . Please describe it in natural language.