1,5-Methano-3H-cyclopent(c)oxepin-3-one, octahydro- 55764-18-6 8-Oxa-9-ketotricyclo(5.3.1.0(sup 2,6))undecane 8-Oxatricyclo(5.3.1.0(sup 2,6))undecane, 9-oxo- EINECS 259-798-6 Octahydro-1,5-methano-3H-cyclopen(c)oxepin-3-one Octahydro-1,5-methano-3H-cyclopent(c)oxepin-3-one