SEARCH Articles Figures Tables 1- Substituted-perimidin-2-ones 2,3-Dihydro-2 spiro-4 - perimidine Benzo perimidin-7-ones Perimidin-2-ones Perimidine 1.2- disubstituted Perimidine 2- thiones Perimidine derivatives Perimidine, prototropic tautomerism Perimidine-2-thione Perimidines Perimidines Perimidines, 2,3-dihydro Perimidines, 2-amino Thermochromic perimidine