2-[[4-(4-fluorobenzoyl)piperidin-1-yl]methyl]-1,2,3,9-tetrahydrocarbazol-4-one
2-[[4-(4-fluorobenzoyl)-1-piperidyl]methyl]-1,2,3,9-tetrahydrocarbazol-4-one
2-[[4-[(4-fluorophenyl)-oxomethyl]-1-piperidinyl]methyl]-1,2,3,9-tetrahydrocarbazol-4-one
2-[[4-(4-fluorophenyl)carbonylpiperidin-1-yl]methyl]-1,2,3,9-tetrahydrocarbazol-4-one