(3S,4R,5R)-oxane-2,3,4,5-tetrol (3S,4R,5R)-tetrahydropyran-2,3,4,5-tetrol 50986-18-0 87-72-9 D-(−)-Arabinose nchembio828-comp5 A9432_SIGMA C00216 EINECS 201-767-6 CHEBI:46994 D-arabinopyranose A6085_SIGMA NCGC00165986-01 A3131_SIGMA