(2S,3R)-2,3-dimethylcyclopentanone InChI=1/C7H12O/c1-5-3-4-7(8)6(5)2/h5-6H,3-4H2,1-2H3/t5-,6+/m1/s cyclopentanone, 2,3-dimethyl-, (2S,3R)-