2,4,6-Cycloheptatrien-1-one, 2-hydroxy- 2-Hydroxycyclohepta-2,4,6-trienone 2-Hydroxytropone 4-08-00-00159 (Beilstein Handbook Reference) 533-75-5 BRN 1904978 CCRIS 6609 CI TROPOLONE 8 EINECS 208-577-2 NSC 89303 Purpurocatechol Tropolone