(2R,3S)-3-(hydroxymethyl)-2-methylcyclopentanone InChI=1/C7H12O2/c1-5-6(4-8)2-3-7(5)9/h5-6,8H,2-4H2,1H3/t5-,6-/m1/s cyclopentanone, 3-(hydroxymethyl)-2-methyl-, (2R,3S)-