(3S,4R)-6-Acetyl-3,4-dihydroxy-2,2-dimethylchromane 1-(3,4-Dihydroxy-2,2-dimethyl-chroman-6-yl)-ethanone InChI=1/C13H16O4/c1-7(14)8-4-5-10-9(6-8)11(15)12(16)13(2,3)17-10/h4-6,11-12,15-16H,1-3H3/t11-,12+/m1/s ethanone, 1-[(3S,4R)-3,4-dihydro-3,4-dihydroxy-2,2-dimethyl-2H-1-benzopyran-6-yl]- rel-1-[(3R,4S)-3,4-dihydroxy-2,2-dimethyl-3,4-dihydro-2H-chromen-6-yl]ethanone