molecular entity glucitol Beilstein:1721909 C6H14O6 CHEBI:15093 CHEBI:26724 CHEBI:26726 CHEBI:30911 CHEBI:33795 CHEBI:33796 CHEBI:9201 Gmelin:83165 Sorbitol chebi_ontology glucitol gulitol rel-(2R,3R,4R,5S)-hexane-1,2,3,4,5,6-hexol sorbitol