(3R)-3-hydroxybutan-2-one HBR R,3-HYDROXYBUTAN-2-ONE 2-BUTANONE,3-HYDROXY (DL) MFC4 H8 O2 CHEBI:15686 InChI=1/C4H8O2/c1-3(5)4(2)6/h3,5H,1-2H ZINC00895240 C00810