2-(n-Heptyl)-4-hydroxyquinoline N-oxide 2-Heptyl-4-hydroxyquinoline N-oxide 2-Heptyl-4-hydroxyquinoline oxide 341-88-8 4-Quinolinol, 2-heptyl-, 1-oxide BRN 1466419 HQNO KF 8940 Pyo II