SEARCH Articles Figures Tables 2-Ethoxy-3,4-dihydro-2H-pyran 2-Ethoxy-3,4-dihydro-l,2-pyrane 5- Ethoxy-3.4-dihydro-277-pyrrole 6- Ethoxy-4,5-dihydro-2 -pyridone 6-Ethoxy-l,2-dihydro-2,2,4-trimethylquinoline