13,13-dimethyl-3,4,9,10-tetraphenyl-1-oxa-8-azadispiro[4.1.4⁷.3⁵]tetradeca-3,9-diene-2,11-dione

13,13-dimethyl-3,4,9,10-tetraphenyl-1-oxa-8-azadispiro[4.1.4⁷.3⁵]tetradeca-3,9-diene-2,11-dione

1,9,9-trimethyl-3,4-diphenyl-1-azaspiro[4.5]dec-3-ene-2,7-dione

8,13,13-Trimethyl-3,4,9,10-tetraphenyl-1-oxa-8-aza-dispiro[4.1.4.3]tetradeca-3,9-diene-2,11-dione

ethyl 2-(2-methyl-5-oxo-3,4-diphenyl-2,5-dihydro-1H-pyrrol-2-yl)acetate