Structure based on 1gka

Ideal structure
Name: astaxanthin
Formula: C40 H52 O4
Weight: 596.838
SMILES: "CC(=CC=CC=C(C)C=CC=C(C)C=CC1=C(C)C(=O)[CH](O)CC1(C)C)C=CC=C(C)C=CC2=C(C)C(=O)[CH](O)CC2(C)C"
Spacial conformation based on PDB 1gka.
Also present on 6zzx, 8c18, 8i34
RESIDUE   AXT     96
CONECT      C1     4 C2   C6   C16  C17 
CONECT      C2     4 C1   C3   HC21 HC22
CONECT      C3     4 C2   C4   O3   H3  
CONECT      C4     3 C3   C5   O4  
CONECT      C5     3 C4   C6   C18 
CONECT      C6     3 C1   C5   C7  
CONECT      C7     3 C6   C8   H7  
CONECT      C8     3 C7   C9   H8  
CONECT      C9     3 C8   C10  C19 
CONECT      C10    3 C9   C11  H10 
CONECT      C11    3 C10  C12  H11 
CONECT      C12    3 C11  C13  H12 
CONECT      C13    3 C12  C14  C20 
CONECT      C14    3 C13  C15  H14 
CONECT      C15    3 C14  C35  H15 
CONECT      C16    4 C1   H161 H162 H163
CONECT      C17    4 C1   H171 H172 H173
CONECT      C18    4 C5   H181 H182 H183
CONECT      C19    4 C9   H191 H192 H193
CONECT      C20    4 C13  H201 H202 H203
CONECT      O3     2 C3   HA  
CONECT      O4     1 C4  
CONECT      C21    4 C22  C26  C36  C37 
CONECT      C22    4 C21  C23  H221 H222
CONECT      C23    4 C22  C24  O23  H23 
CONECT      C24    3 C23  C25  O24 
CONECT      C25    3 C24  C26  C38 
CONECT      C26    3 C21  C25  C27 
CONECT      C27    3 C26  C28  H27 
CONECT      C28    3 C27  C29  H28 
CONECT      C29    3 C28  C30  C39 
CONECT      C30    3 C29  C31  H30 
CONECT      C31    3 C30  C32  H31 
CONECT      C32    3 C31  C33  H32 
CONECT      C33    3 C32  C34  C40 
CONECT      C34    3 C33  C35  H34 
CONECT      C35    3 C15  C34  H35 
CONECT      C36    4 C21  H361 H362 H363
CONECT      C37    4 C21  H371 H372 H373
CONECT      C38    4 C25  H381 H382 H383
CONECT      C39    4 C29  H391 H392 H393
CONECT      C40    4 C33  H401 H402 H403
CONECT      O24    1 C24 
CONECT      O23    2 C23  HB  
CONECT      HC21   1 C2  
CONECT      HC22   1 C2  
CONECT      H3     1 C3  
CONECT      H7     1 C7  
CONECT      H8     1 C8  
CONECT      H10    1 C10 
CONECT      H11    1 C11 
CONECT      H12    1 C12 
CONECT      H14    1 C14 
CONECT      H15    1 C15 
CONECT      H161   1 C16 
CONECT      H162   1 C16 
CONECT      H163   1 C16 
CONECT      H171   1 C17 
CONECT      H172   1 C17 
CONECT      H173   1 C17 
CONECT      H181   1 C18 
CONECT      H182   1 C18 
CONECT      H183   1 C18 
CONECT      H191   1 C19 
CONECT      H192   1 C19 
CONECT      H193   1 C19 
CONECT      H201   1 C20 
CONECT      H202   1 C20 
CONECT      H203   1 C20 
CONECT      HA     1 O3  
CONECT      H221   1 C22 
CONECT      H222   1 C22 
CONECT      H23    1 C23 
CONECT      H27    1 C27 
CONECT      H28    1 C28 
CONECT      H30    1 C30 
CONECT      H31    1 C31 
CONECT      H32    1 C32 
CONECT      H34    1 C34 
CONECT      H35    1 C35 
CONECT      H361   1 C36 
CONECT      H362   1 C36 
CONECT      H363   1 C36 
CONECT      H371   1 C37 
CONECT      H372   1 C37 
CONECT      H373   1 C37 
CONECT      H381   1 C38 
CONECT      H382   1 C38 
CONECT      H383   1 C38 
CONECT      H391   1 C39 
CONECT      H392   1 C39 
CONECT      H393   1 C39 
CONECT      H401   1 C40 
CONECT      H402   1 C40 
CONECT      H403   1 C40 
CONECT      HB     1 O23 
END   
HET    AXT             96
HETSYN     AXT 3,3'-DIHYDROXY-BETA,BETA-CAROTENE-4,4'-DIONE
HETNAM     AXT ASTAXANTHIN
FORMUL      AXT    C40 H52 O4

This OCA MONOMER page
uses Jmol, developed by the Jmol Development Team (color reference)
OCA© by Jaime Prilusky, 1996-2004,2006,2010,2014
Bioinformatics Unit
Weizmann Institute of Science