"Ethyl 4-{2,4-dioxo-3-azatricyclo[7.3.1.0 {5,13}]-trideca-1(13),5,7,9,11- pentaen-3-yl}butanoate "
"Ethyl 4-{2,4-dioxo-3-azatricyclo[7.3.1.0 {5,13}]-trideca-1(13),5,7,9,11- pentaen-3-yl}butanoate "
"Ethyl 4-{2,4-dioxo-3-azatricyclo[7.3.1.0 {5,13}]-trideca-1(13),5,7,9,11- pentaen-3-yl}butanoate "