Structure based on 1rwt

Ideal structure
Name: chlorophyll b
Formula: C55 H70 Mg N4 O6
Weight: 907.472
SMILES: "CCC1=C(C=O)C2=Cc3n4c(C=C5[CH](C)[CH](CCC(=O)OCC=C(C)CCC[CH](C)CCC[CH](C)CCCC(C)C)C6=[N+]5[Mg]47N8C(=CC1=[N+]27)C(=C9C(=O)[CH](C(=O)OC)C6=C89)C)c(C)c3C=C"
Spacial conformation based on PDB 1rwt.
Also present in other 50 PDB entries.
RESIDUE   CHL    136
CONECT      MG     4 NA   NB   NC   ND  
CONECT      CHA    3 C1A  C4D  CBD 
CONECT      CHB    3 C4A  C1B  H1  
CONECT      CHC    3 C4B  C1C  H2  
CONECT      CHD    3 C4C  C1D  H3  
CONECT      NA     3 MG   C1A  C4A 
CONECT      C1A    3 CHA  NA   C2A 
CONECT      C2A    4 C1A  C3A  CAA  H67 
CONECT      C3A    4 C2A  C4A  CMA  H68 
CONECT      C4A    3 CHB  NA   C3A 
CONECT      CMA    4 C3A  H4   H5   H6  
CONECT      CAA    4 C2A  CBA  H7   H8  
CONECT      CBA    4 CAA  CGA  H9   H10 
CONECT      CGA    3 CBA  O1A  O2A 
CONECT      O1A    1 CGA 
CONECT      O2A    2 CGA  C1  
CONECT      NB     3 MG   C1B  C4B 
CONECT      C1B    3 CHB  NB   C2B 
CONECT      C2B    3 C1B  C3B  CMB 
CONECT      C3B    3 C2B  C4B  CAB 
CONECT      C4B    3 CHC  NB   C3B 
CONECT      CMB    4 C2B  H11  H12  H13 
CONECT      CAB    3 C3B  CBB  H14 
CONECT      CBB    3 CAB  H15  H16 
CONECT      NC     3 MG   C1C  C4C 
CONECT      C1C    3 CHC  NC   C2C 
CONECT      C2C    3 C1C  C3C  CMC 
CONECT      C3C    3 C2C  C4C  CAC 
CONECT      C4C    3 CHD  NC   C3C 
CONECT      CMC    3 C2C  OMC  H17 
CONECT      OMC    1 CMC 
CONECT      CAC    4 C3C  CBC  H18  H19 
CONECT      CBC    4 CAC  H20  H21  H22 
CONECT      ND     3 MG   C1D  C4D 
CONECT      C1D    3 CHD  ND   C2D 
CONECT      C2D    3 C1D  C3D  CMD 
CONECT      C3D    3 C2D  C4D  CAD 
CONECT      C4D    3 CHA  ND   C3D 
CONECT      CMD    4 C2D  H23  H24  H25 
CONECT      CAD    3 C3D  OBD  CBD 
CONECT      OBD    1 CAD 
CONECT      CBD    4 CHA  CAD  CGD  H26 
CONECT      CGD    3 CBD  O1D  O2D 
CONECT      O1D    1 CGD 
CONECT      O2D    2 CGD  CED 
CONECT      CED    4 O2D  H27  H28  H29 
CONECT      C1     4 O2A  C2   H30  H31 
CONECT      C2     3 C1   C3   H32 
CONECT      C3     3 C2   C4   C5  
CONECT      C4     4 C3   H33  H34  H35 
CONECT      C5     4 C3   C6   H36  H37 
CONECT      C6     4 C5   C7   H38  H39 
CONECT      C7     4 C6   C8   H40  H41 
CONECT      C8     4 C7   C9   C10  H42 
CONECT      C9     4 C8   H43  H44  H45 
CONECT      C10    4 C8   C11  H46  H47 
CONECT      C11    4 C10  C12  H48  H49 
CONECT      C12    4 C11  C13  H50  H51 
CONECT      C13    4 C12  C14  C15  H52 
CONECT      C14    4 C13  H53  H54  H55 
CONECT      C15    4 C13  C16  H56  H69 
CONECT      C16    4 C15  C17  H57  H70 
CONECT      C17    4 C16  C18  H58  H59 
CONECT      C18    4 C17  C19  C20  H60 
CONECT      C19    4 C18  H61  H62  H63 
CONECT      C20    4 C18  H64  H65  H66 
CONECT      H1     1 CHB 
CONECT      H2     1 CHC 
CONECT      H3     1 CHD 
CONECT      H4     1 CMA 
CONECT      H5     1 CMA 
CONECT      H6     1 CMA 
CONECT      H7     1 CAA 
CONECT      H8     1 CAA 
CONECT      H9     1 CBA 
CONECT      H10    1 CBA 
CONECT      H11    1 CMB 
CONECT      H12    1 CMB 
CONECT      H13    1 CMB 
CONECT      H14    1 CAB 
CONECT      H15    1 CBB 
CONECT      H16    1 CBB 
CONECT      H17    1 CMC 
CONECT      H18    1 CAC 
CONECT      H19    1 CAC 
CONECT      H20    1 CBC 
CONECT      H21    1 CBC 
CONECT      H22    1 CBC 
CONECT      H23    1 CMD 
CONECT      H24    1 CMD 
CONECT      H25    1 CMD 
CONECT      H26    1 CBD 
CONECT      H27    1 CED 
CONECT      H28    1 CED 
CONECT      H29    1 CED 
CONECT      H30    1 C1  
CONECT      H31    1 C1  
CONECT      H32    1 C2  
CONECT      H33    1 C4  
CONECT      H34    1 C4  
CONECT      H35    1 C4  
CONECT      H36    1 C5  
CONECT      H37    1 C5  
CONECT      H38    1 C6  
CONECT      H39    1 C6  
CONECT      H40    1 C7  
CONECT      H41    1 C7  
CONECT      H42    1 C8  
CONECT      H43    1 C9  
CONECT      H44    1 C9  
CONECT      H45    1 C9  
CONECT      H46    1 C10 
CONECT      H47    1 C10 
CONECT      H48    1 C11 
CONECT      H49    1 C11 
CONECT      H50    1 C12 
CONECT      H51    1 C12 
CONECT      H52    1 C13 
CONECT      H53    1 C14 
CONECT      H54    1 C14 
CONECT      H55    1 C14 
CONECT      H56    1 C15 
CONECT      H57    1 C16 
CONECT      H58    1 C17 
CONECT      H59    1 C17 
CONECT      H60    1 C18 
CONECT      H61    1 C19 
CONECT      H62    1 C19 
CONECT      H63    1 C19 
CONECT      H64    1 C20 
CONECT      H65    1 C20 
CONECT      H66    1 C20 
CONECT      H67    1 C2A 
CONECT      H68    1 C3A 
CONECT      H69    1 C15 
CONECT      H70    1 C16 
HET    CHL            136
FORMUL      CHL    C55 H70 Mg1 N4 O6 2+

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