3-Cyclobutene-1,2-dione32936-74-6100 % similar Cyclopropenone2961-80-038 % similar Tropolone533-75-535 % similar 4,7-Dihydroxy-1,10-phenanthroline3922-40-533 % similar 3-Chloro-4-hydroxypyridine89284-20-832 % similar 3-Methyl-4-hydroxypyridine22280-02-030 % similar 3-Fluoro-4-pyridinol22282-73-130 % similar 3-Bromo-4-pyridinol36953-41-030 % similar 3-Hydroxy-4-pyrone496-63-930 % similar 3-Aminopyridin-4-ol6320-39-430 % similar