氨气

2-吡咯烷酮

4-羟基-2,5-二甲基-3(2H)呋喃酮

2-乙酰基-1,4,5,6-四氢吡啶,2-乙酰基-1,4,5,6-四氢吡啶,1-(1,4,5,6-四氢-2-吡啶)-乙酮

1-(L-proline)-1-deoxy-D-fructose