GO:0052899:   N(1),N(12)-diacetylspermine:oxygen oxidoreductase (3-acetamidopropanal-forming) activity
Catalysis of the reaction: H(2)O + N(1),N(12)-diacetylspermine + O(2) = 3-acetamidopropanal + H(2)O(2) + N(1)-acetylspermidine.