lactose (+)-lactose (2R,3S,4S,5R,6S)-2-(hydroxymethyl)-6-[(2R,3R,4S,5R,6S)-4,5,6-trihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-oxane-3,4,5-triol (2R,3S,4S,5R,6S)-2-(hydroxymethyl)-6-[(2R,3R,4S,5R,6S)-4,5,6-trihydroxy-2-(hydroxymethyl)tetrahydropyran-3-yl]oxy-tetrahydropyran-3,4,5-triol (2R,3S,4S,5R,6S)-2-methylol-6-[(2R,3R,4S,5R,6S)-4,5,6-trihydroxy-2-methylol-tetrahydropyran-3-yl]oxy-tetrahydropyran-3,4,5-triol (Gal)1 (Glc)1 1-beta-D-Galactopyranosyl-4-D-glucopyranose 4-(beta-D-galactosido)-D-glucose 4-O-beta-D-galactopyranosyl-D-glucose A disaccharide, found most notably in milk, that consists of D-galactose and D-glucose fragments bonded through a beta-1->4 glycosidic linkage. The glucose fragment can be in either the alpha- or beta-pyranose form, whereas the galactose fragment can only have the beta-pyranose form. Beilstein:1292745 C12H22O11 CHEBI:10296 CHEBI:10380 CHEBI:14497 CHEBI:17716 CHEBI:22460 CHEBI:22760 CHEBI:25005 CHEBI:27755 CHEBI:613009 ChEMBL:19053747 ChemIDplus:63-42-3 CiteXplore:1292745 CiteXplore:17329833 CiteXplore:18300214 CiteXplore:19846069 CiteXplore:19913595 CiteXplore:20094999 CiteXplore:20503067 CiteXplore:20699559 CiteXplore:20873837 CiteXplore:20961532 CiteXplore:21403918 CiteXplore:2432147 CiteXplore:2456994 CiteXplore:6194884 CiteXplore:7574700 D-lactose GUBGYTABKSRVRQ-QKKXKWKRSA-N Galbeta1-4-Glc Gmelin:882872 InChI=1S/C12H22O11/c13-1-3-5(15)6(16)9(19)12(22-3)23-10-4(2-14)21-11(20)8(18)7(10)17/h3-20H,1-2H2/t3-,4-,5+,6+,7-,8-,9-,10-,11?,12+/m1/s1 KEGG COMPOUND:63-42-3 KEGG COMPOUND:C00243 KEGG DRUG:D00046 KEGG GLYCAN:G10504 KNApSAcK:C00001136 Lac Laktobiose Laktose Milchzucker Milk sugar NIST Chemistry WebBook:63-42-3 OC[C@H]1O[C@@H](O[C@@H]2[C@@H](CO)OC(O)[C@H](O)[C@H]2O)[C@H](O)[C@@H](O)[C@H]1O Reaxys:1292745 beta-D-Gal-(1->4)-D-Glc beta-D-Galp-(1->4)-D-Glcp beta-D-galactopyranosyl-(1->4)-D-glucopyranose beta-Gal1,4-Glc chebi_ontology lactobiose lactose milk sugar molecular entity