3,4,5,6,7,8-六氢-2H-1-苯并吡喃-2-酮

4-oxononanedioic acid

2-phenyl-5,6,7,8-tetrahydro-4H-thiochromene

1-diazonio-4-(2-oxocyclohexyl)but-1-en-2-olate

2,3,3a,4,5,6,7,8a-octahydroazulene-1,8-dione