Synonyms: 1,1',3,3'-Tetramethyl-2,2'-spirobi(2,3-dihydro-1H-perimidine);99643-41-1;1,1',3,3'-Tetramethyl-2,2'-spirobi[2,3-dihydro-1H-perimidine];AC1L3R00;1,1',3,3'-tetramethyl-2,2'-spirobi[perimidine];1,1',3,3'-tetramethyl-1H,1'H,3H,3'H-2,2'-spirobi[perimidine]