RESIDUE   NAO      4
CONECT      NA     1 O1  
CONECT      O1     3 NA   HO11 HO12
CONECT      HO11   1 O1  
CONECT      HO12   1 O1  
END   
HET    NAO              4
HETNAM     NAO SODIUM ION, 1 WATER COORDINATED
FORMUL      NAO    H2 Na1 O1