Structure based on 1ocr
Name: heme-a
Formula: C49 H56 Fe N4 O6
Weight: 852.837
SMILES: "CC(C)=CCCC(C)=CCCC(C)=CCC[CH](O)C1=C(C)C2=N3|[Fe]45|N6=C(C=c7n4c(=C2)c(C=O)c7CCC(O)=O)C(=C(C)C6=Cc8n5c(C=C13)c(C)c8C=C)CCC(O)=O"
Spacial conformation based on PDB 1ocr.
Also present in other 101 PDB entries.
RESIDUE   HEA    116
CONECT      FE     4 NA   NB   NC   ND  
CONECT      CHA    3 C1A  C4D  HHA 
CONECT      CHB    3 C4A  C1B  HHB 
CONECT      CHC    3 C4B  C1C  HHC 
CONECT      CHD    3 C4C  C1D  HHD 
CONECT      NA     3 FE   C1A  C4A 
CONECT      C1A    3 CHA  NA   C2A 
CONECT      C2A    3 C1A  C3A  CAA 
CONECT      C3A    3 C2A  C4A  CMA 
CONECT      C4A    3 CHB  NA   C3A 
CONECT      CMA    3 C3A  OMA  HMA 
CONECT      OMA    1 CMA 
CONECT      CAA    4 C2A  CBA  HAA1 HAA2
CONECT      CGA    3 CBA  O1A  O2A 
CONECT      O1A    1 CGA 
CONECT      O2A    2 CGA  H2A 
CONECT      NB     3 FE   C1B  C4B 
CONECT      C1B    3 CHB  NB   C2B 
CONECT      C2B    3 C1B  C3B  CMB 
CONECT      C3B    3 C2B  C4B  C11 
CONECT      C4B    3 CHC  NB   C3B 
CONECT      CMB    4 C2B  HMB1 HMB2 HMB3
CONECT      NC     3 FE   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    4 C2C  HMC1 HMC2 HMC3
CONECT      CAC    3 C3C  CBC  HAC 
CONECT      ND     3 FE   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  HMD1 HMD2 HMD3
CONECT      CAD    4 C3D  CBD  HAD1 HAD2
CONECT      CGD    3 CBD  O1D  O2D 
CONECT      O1D    1 CGD 
CONECT      O2D    2 CGD  H2D 
CONECT      C11    4 C3B  O11  C12  H11 
CONECT      O11    2 C11  HO1 
CONECT      C12    4 C11  C13  H121 H122
CONECT      C13    4 C12  C14  H131 H132
CONECT      C14    3 C13  C15  H14 
CONECT      C15    3 C14  C16  C26 
CONECT      C16    4 C15  C17  H161 H162
CONECT      C17    4 C16  C18  H171 H172
CONECT      C18    3 C17  C19  H18 
CONECT      C19    3 C18  C20  C27 
CONECT      C20    4 C19  C21  H201 H202
CONECT      C21    4 C20  C22  H211 H212
CONECT      C22    3 C21  C23  H22 
CONECT      C23    3 C22  C24  C25 
CONECT      C24    4 C23  H241 H242 H243
CONECT      C25    4 C23  H251 H252 H253
CONECT      C26    4 C15  H261 H262 H263
CONECT      C27    4 C19  H271 H272 H273
CONECT      HHA    1 CHA 
CONECT      HHB    1 CHB 
CONECT      HHC    1 CHC 
CONECT      HHD    1 CHD 
CONECT      HMA    1 CMA 
CONECT      HAA1   1 CAA 
CONECT      HAA2   1 CAA 
CONECT      HBA1   1 CBA 
CONECT      HBA2   1 CBA 
CONECT      H2A    1 O2A 
CONECT      HMB1   1 CMB 
CONECT      HMB2   1 CMB 
CONECT      HMB3   1 CMB 
CONECT      HMC1   1 CMC 
CONECT      HMC2   1 CMC 
CONECT      HMC3   1 CMC 
CONECT      HAC    1 CAC 
CONECT      HBC1   1 CBC 
CONECT      HBC2   1 CBC 
CONECT      HMD1   1 CMD 
CONECT      HMD2   1 CMD 
CONECT      HMD3   1 CMD 
CONECT      HAD1   1 CAD 
CONECT      HAD2   1 CAD 
CONECT      HBD1   1 CBD 
CONECT      HBD2   1 CBD 
CONECT      H2D    1 O2D 
CONECT      H11    1 C11 
CONECT      HO1    1 O11 
CONECT      H121   1 C12 
CONECT      H122   1 C12 
CONECT      H131   1 C13 
CONECT      H132   1 C13 
CONECT      H14    1 C14 
CONECT      H161   1 C16 
CONECT      H162   1 C16 
CONECT      H171   1 C17 
CONECT      H172   1 C17 
CONECT      H18    1 C18 
CONECT      H201   1 C20 
CONECT      H202   1 C20 
CONECT      H211   1 C21 
CONECT      H212   1 C21 
CONECT      H22    1 C22 
CONECT      H241   1 C24 
CONECT      H242   1 C24 
CONECT      H243   1 C24 
CONECT      H251   1 C25 
CONECT      H252   1 C25 
CONECT      H253   1 C25 
CONECT      H261   1 C26 
CONECT      H262   1 C26 
CONECT      H263   1 C26 
CONECT      H271   1 C27 
CONECT      H272   1 C27 
CONECT      H273   1 C27 
HET    HEA            116
FORMUL      HEA    C49 H56 Fe1 N4 O6

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