1,4,5,8-tetramethyl-decahydro-pyrazino[2,3-b]pyrazine

[1,4]Oxazino[3,2-b]-1,4-oxazine, octahydro-4,8-dimethyl-

4,5,8-三甲基八氢-2H-吡嗪并[2,3-b][1,4]恶嗪

1,4-dimethylpiperazin-2-one

N-甲基-2-吗啉酮