Cc1n[nH]c(=O)[nH]c1=O    mol9159    0_1
Cc1n[nH]c(=O)[n-]c1=O    mol9159    -1_1
Cc1n[n-]c(=O)[nH]c1=O    mol9159    -1_2
Cc1n[n-]c(=O)[n-]c1=O    mol9159    -2_1