COc1c([N+](=O)[O-])cc([N+](=O)[O-])c(O)c1[N+](=O)[O-] mol10093 0_1 COc1c([N+](=O)[O-])cc([N+](=O)[O-])c([O-])c1[N+](=O)[O-] mol10093 -1_1