CN1C=C(C=CC1=O)C(=O)OC1C(OC(C)=O)C2(COC(C)=O)C(OC(C)=O)C(OC(C)=O)C3C(OC(C)=O)C22OC3(C)COC(=O)C3=CC=CN=C3CCC(C)(O)C(=O)OC1C2(C)O