2-phenyl-4,5,8,9-tetrahydro-5,8-ethano[1,2,4]triazolo[1,2-a]pyridazine-1,3-dione

三甲基硅烷化重氮甲烷

phenyl isocyanate

4,6-dimethyl-3-phenyl-1,3-diazabicyclo[2.2.0]hex-5-en-2-one