4'-ethyl-1',4',7',8'-tetrahydro-4'-hydroxy-3'H,10'H-spiro[1,3-dioxolane-2,6'-pyrano[3,4-f]indolizine]-3',10'-dione

ethyl (2E)-4-(3-(methoxymethyl)quinolin-2-yl)-4-((methylsulfonyl)imino)but-2-enoate

ethyl (E)-4-(3-(methoxymethyl)quinolin-2-yl)-4-oxobut-2-enoate

2-ethoxy-3-(ethoxymethyl)-6-[3-(methoxymethyl)quinolin-2-yl]isonicotinic acid ethyl ester

1-[2-ethoxy-3-(ethoxymethyl)-6-[3-(methoxymethyl)quinolin-2-yl]pyridin-4-yl]propan-1-one