3,5,7,7-tetramethyl-3,5-diazabicyclo[4.2.0]octane-2,4-dione

2,4,7,7-tetramethyl-2,4-diazabicyclo[4.2.0]octane-3,5-dione

2,4,6,7,7-pentamethyl-2,4-diazabicyclo[4.2.0]octane-3,5-dione

2,4,6,8,8-pentamethyl-2,4-diazabicyclo[4.2.0]octane-3,5-dione

O-叔丁基-N-[(苯基甲氧基)羰基]-L-酪氨酸乙酯