9-(4-methoxybenzyl)-4,4-dimethyl-1-oxo-1,3,4,9-tetrahydrospiro[carbazole-2,1'-cyclopropane]-6-carboxylic acid

tert-butyl 3-(2,2-diethyl-9-(4-methoxybenzyl)-4,4-dimethyl-1-oxo-2,3,4,9-tetrahydro-1H-carbazole-6-carboxamido)pyrrolidine-1-carboxylate

2,2-diethyl-4,4-dimethyl-1-oxo-N-(pyrrolidin-3-yl)-2,3,4,9-tetrahydro-1H-carbazole-6-carboxamide

2,2-diethyl-9-(4-methoxybenzyl)-4,4-dimethyl-1-oxo-2,3,4,9-tetrahydro-1H-carbazole-6-carboxylic acid

methyl 9-(4-methoxybenzyl)-2-(methoxymethyl)-4,4-dimethyl-1-oxo-2,3,4,9-tetrahydro-1H-carbazole-6-carboxylate