2,3-bis(trimethylsilyloximinomethyl)but-2E,Z-en-1,4-dicarboxylic acid dimethyl ester

1,1,3,3-tetramethyl-5-thia-7,8-diazaspiro[3.4]oct-7-en-2-one

3-(1-萘基)-2,4-二氧杂螺[5.5]十一烷