HETNAM      ZN ZINC ION                                                         
HETNAM      MG MAGNESIUM ION                                                    
HETNAM     SO4 SULFATE ION                                                      
HETNAM     EDO 1,2-ETHANEDIOL                                                   
HETSYN     EDO ETHYLENE GLYCOL                                                  
FORMUL   3   ZN    4(ZN 2+)                                                     
FORMUL   5   MG    2(MG 2+)                                                     
FORMUL   6  SO4    11(O4 S 2-)                                                  
FORMUL  12  EDO    3(C2 H6 O2)                                                  
FORMUL  23  HOH   *847(H2 O)