Cc1[nH+]snc1/C=N\[O-] mol20494 0_1 Cc1nsnc1/C=N\O mol20494 0_2 Cc1ns[nH+]c1/C=N\[O-] mol20494 0_3 Cc1nsnc1/C=N\[O-] mol20494 -1_1