Oc1nsc2c1CNCC2 mol21113 0_1 [O-]c1nsc2c1C[NH2+]CC2 mol21113 0_2 Oc1[nH+]sc2c1CNCC2 mol21113 1_1 Oc1nsc2c1C[NH2+]CC2 mol21113 1_2 [O-]c1nsc2c1CNCC2 mol21113 -1_1