SEARCH Articles Figures Tables 3- Ethyl-2-methyl-4//-pyrido pyrimidin-4-thione 7-Cyano-3-ethyl-2-methyl-4//-pyrido 9- Hydroxy-2-methyl-3- 2- ethyl 6,7,8,9-tetrahydro-4//-pyrido Ethyl 2-chloro-6-methyl-4//-pyrido Ethyl 9-ethoxycarbonyl-3-methyl-6-oxo2H,6H-pyrido thiazine-4carboxylates