quercetin + O2 => 2-(3,4-dihydroxybenzoyloxy)-4,6-dihydroxybenzoate + CO
quercetin + o2 => 2-(3,4-dihydroxybenzoyloxy)-4,6-dihydroxybenzoate + co
quercetin + O2 => 2-(3,4-dihydroxybenzoyloxy)-4,6-dihydroxybenzoate + CO
quercetin + o2 => 2-(3,4-dihydroxybenzoyloxy)-4,6-dihydroxybenzoate + co