2-(6-oxobenzo[c]isochromen-3-yl)oxyacetic acid 2-[(6-oxo-3-benzo[c]isochromenyl)oxy]acetic acid 2-(6-ketobenzo[c]isochromen-3-yl)oxyacetic acid 2-(6-oxobenzo[c]isochromen-3-yl)oxyethanoic acid IDI1_009007 SBB015145 Oprea1_428367 Oprea1_521421 IFLab1_001140