1-(1,2,3,3a,4,6a-hexahydropentalen-1-yl)-2,2-dimethylpropan-1-one 1-propanone, 1-(1,2,3,3a,4,6a-hexahydro-1-pentalenyl)-2,2-dimethyl- InChI=1/C13H20O/c1-13(2,3)12(14)11-8-7-9-5-4-6-10(9)11/h4,6,9-11H,5,7-8H2,1-3H