2-Hydroxymethylenebenzosuber-1-one 40685-11-8 5H-Benzocyclohepten-5-one, 6,7,8,9-tetrahydro-6-(hydroxymethylene)- 6,7,8,9-Tetrahydro-6-(hydroxymethylene)-5H-benzocyclohepten-5-one BRN 2049683