(2S,5S)-2,5-dimethylcyclopentanone InChI=1/C7H12O/c1-5-3-4-6(2)7(5)8/h5-6H,3-4H2,1-2H3/t5-,6-/m0/s cyclopentanone, 2,5-dimethyl-, (2S,5S)-