NH2OH (Hydroxylamine HA 羟胺) C(i) A(a) HNH H O C(a) HA HNH H H O H H N HO HN H H O H H N HO N HNH2OH (Hydroxylamine HA 羟胺) C(i) A(a) HNH H O C(a) HA HNH H H O H H N HO HN H H O H H N HO N H