2,7-dioxaspiro[4.4]nonane-3,8-dione

1,3,6,8-tetrahydro-2,4,5,7-pyrimido<5,4-g>pteridinetetrone

4-Oxocyclohexane-1,1-dicarboxylic acid

[(Z)-2-bromoethenyl]benzene

3-羥酞酸