SEARCH Articles Figures Tables 2- Substituted-7- perhydropyrido pyrazine 2- perhydropyrido pyrazin-3-one 3-[ perhydropyrido 6- perhydropyrido pyrazines 6- perhydropyrido pyrazines 6-Formyl-2- perhydropyrido pyrazine 7-Hydroxyethyl-2- perhydropyrido pyrazines Perhydropyrido pyrazine-3,4-dione Perhydropyrido pyrazine-4-ones Perhydropyrido pyrazines preparation Perhydropyrido pyrazines reactions