Wikipedia:  

Glycogen

Glycogen
Molecular Formula
C24 H42 O21
Natural Isotopic Abundance Mass
666.5776800000
Mono-Isotopic Molecular Masses
C12N14:   666.221858412
C13N14:   690.302374519
C12N15:   666.221858412
C13N15:   690.302374519
Glycogen image
Glycogen
InCHi String:
InChI=1S/C24H42O21/c25-1-5-9(28)11(30)16(35)22(41-5)39-4-8-20(45-23-17(36)12(31)10(29)6(2-26)42-23)14(33)18(37)24(43-8)44-19-7(3-27)40-21(38)15(34)13(19)32/h5-38H,1-4H2/t5-,6-,7-,8-,9-,10-,11+,12+,13-,14-,15-,16-,17-,18-,19-,20-,21+,22+,23-,24-/m1/s1

isomeric SMILES:
C([C@@H]1[C@H]([C@@H]([C@H]([C@H](O1)OC[C@@H]2[C@H]([C@@H]([C@H]([C@H](O2)O[C@@H]3[C@H](O[C@@H]([C@@H]([C@H]3O)O)O)CO)O)O)O[C@@H]4[C@@H]([C@H]([C@@H]([C@H](O4)CO)O)O)O)O)O)O)O
canonical SMILES:
C(C1C(C(C(C(O1)OCC2C(C(C(C(O2)OC3C(OC(C(C3O)O)O)CO)O)O)OC4C(C(C(C(O4)CO)O)O)O)O)O)O)O


IUPAC: IUPAC systematic
(2R,3R,4S,5R,6R)-2-[(2R,3R,4S,5R,6R)-4,5-dihydroxy-6-[(2R,3R,4S,5R,6S)-4,5,6-trihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-2-[[(2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxymethyl]oxan-3-yl]oxy-6-(hydroxymethyl)oxane-3,4,5-triol

IUPAC traditional
(2R,3R,4S,5R,6R)-2-[(2R,3R,4S,5R,6R)-4,5-dihydroxy-6-[(2R,3R,4S,5R,6S)-4,5,6-trihydroxy-2-methylol-tetrahydropyran-3-yl]oxy-2-[[(2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-methylol-tetrahydropyran-2-yl]oxymethyl]tetrahydropyran-3-yl]oxy-6-methylol-tetrahydropyran-3,4,5-triol

IUPAC cas: IUPAC openeye
(2R,3R,4S,5R,6R)-2-[(2R,3R,4S,5R,6R)-4,5-dihydroxy-6-[(2R,3R,4S,5R,6S)-4,5,6-trihydroxy-2-(hydroxymethyl)tetrahydropyran-3-yl]oxy-2-[[(2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydropyran-2-yl]oxymethyl]tetrahydropyran-3-yl]oxy-6-(hydroxymethyl)tetrahydropyran-3,4,5-triol



PubChem Substance (SID):   85165042   3482
PubChem Compound (CID):   439177
KEGG: Compound ID   C00182
CAS Registry IDs:   9005-79-2
PDB Chemical Component   n/a
Miscellaneous Databases and IDs:   n/a

Reference data were obtained primarily from the PubChem database.

Three dimensional molecular rendering uses Jmol.