2,4,6-CYCLOHEPTATRIEN-1-ONE, 5-AMINO-2-HYDROXY- 4-14-00-00526 (Beilstein Handbook Reference) 5-Amino-2-hydroxy-2,4,6-cycloheptatrien-1-one 5-Aminotropolone 7021-46-7 BRN 1524779 NSC 102877 VII tropolone