O1COC2=C3C1=C(C)C(=O)c4c(O)c(NC(=O)C(C)=CC=CC(O)(C)C(O)C(C)C(O)C(C(=O)OC)C(OC(=O)C)C(C)C(O)C(O)(C)C=C2C)c(C)c(OC(=O)C)c34