二甲基二硫醚

6-bromo-2-(3,4-dichlorophenyl)-3,4-dihydro-2H-pyrano[2,3-b]pyridine

2-甲氧基吡啶

2-甲氧基-3,5-二溴吡啶

6-bromo-2-(3,4-dichlorophenyl)-2H-pyrano[2,3-b]pyridine