3，6-二乙酰基-N-乙基咔唑

[9-ethyl-6-(hydroxymethyl)carbazol-3-yl]methanol

(9-ethylcarbazol-3-yl)methyl 2-methylprop-2-enoate

2-(9-ethylcarbazole-3-carbonyl)benzoic acid

9-ethyl-3,6-bis-(2-carboxy-benzoyl)-carbazole