2-己烯

4,7-二甲基-1H-茚

2-氯双环[2.2.1]庚-5-烯-2-甲腈

1,2-环己二酮

4-phenyl-2,4,6-triazatricyclo[3.2.1.0(2,6)]dec-8-ene-3,5-dione