1,1',3,3'-tetramethyl-2,2'-spirobi[perimidine];99643-41-1;1,1',3,3'-Tetramethyl-2,2'-spirobi(2,3-dihydro-1H-perimidine);1,1',3,3'-Tetramethyl-2,2'-spirobi[2,3-dihydro-1H-perimidine]
1,1',3,3'-tetramethyl-2,2'-spirobi[perimidine]