Structure based on 1a96

Ideal structure
Name: xanthine
Formula: C5 H4 N4 O2
Weight: 152.111
SMILES: "O=C1NC(=O)c2nc[nH]c2N1"
Spacial conformation based on PDB 1a96.
Also present in other 16 PDB entries.
RESIDUE   XAN     15
CONECT      N9     3 C4   C8   HN9 
CONECT      C4     3 N9   N3   C5  
CONECT      N3     3 C4   C2   HN3 
CONECT      C2     3 N3   O2   N1  
CONECT      O2     1 C2  
CONECT      N1     3 C2   C6   HN1 
CONECT      C6     3 N1   O6   C5  
CONECT      O6     1 C6  
CONECT      C5     3 C4   C6   N7  
CONECT      N7     2 C5   C8  
CONECT      C8     3 N9   N7   H8  
CONECT      HN9    1 N9  
CONECT      HN3    1 N3  
CONECT      HN1    1 N1  
CONECT      H8     1 C8  
END   
HET    XAN             15
HETNAM     XAN XANTHINE
FORMUL      XAN    C5 H4 N4 O2

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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