1,3,7,9-tetramethyl-1H,9H-pyrido[2,3-d,6,5-d']dipyrimidine-2,4,6,8-tetraone

5-(aminomethylidene)-1,3-dimethyl-1,3-diazinane-2,4,6-trione

ethyl 3-(1,3-dimethyl-2,4,6-trioxo-1,3-diazinan-5-yl)-3-oxopropanoate

1,3-二甲基-2,4,6-三氧代-六氢-嘧啶-5-甲醛

1,3,1',3'-tetramethyl-5,5'-methanylylidene-bis-pyrimidine-2,4,6-trione