Cc1[nH]c(=O)[nH]c(=O)c1CO    mol33776    0_1
Cc1[n-]c(=O)[nH]c(=O)c1CO    mol33776    -1_1
Cc1[nH]c(=O)[n-]c(=O)c1CO    mol33776    -1_2
Cc1[nH]c(=O)[nH]c(=O)c1C[O-]    mol33776    -1_3