SEARCH Articles Figures Tables 1.2.3.6.7.116- Hexahydro-4//-pyrido isoquinolin-4-thione 2,3,5,6,7,8-Hexahydro-177-pyrido pyrimidine-1,3-dione 3,4,6,7,8,9-Hexahydro-277-pyrido pyrimidine, basicity 3,4,6,7,8,9-Hexahydro-2H-pyrido 4,4a, 5,6,7,8-Hexahydro-3//-pyrido 4- Aryl-2,3,5,6,7,8-hexahydro-1//-pyrido 4- Aryl-2,3,5,6,7,8-hexahydro-l//-pyrido 6,6a,7,8,9,10-Hexahydro-5//-pyrido 6,6«,7,8,9,10-Hexahydro-5//-pyrido quinoxalines Hexahydro-3//-pyrido structure Hexahydro-8//-pyrido pyrazines