15443-37-5;Octahydro-1,2,4-metheno-3H-cyclobuta [cd] pentalen-3-one;1,2,4-Metheno-3H-cyclobuta[cd]pentalen-3-one, octahydro-;Pentacyclo[5.3.0.0(2,5).0(3,9).0(4,8)]decan-6-one;Octahydro-1,2,4-metheno-3H-cyclobuta(cd)pentalen-3-one