Structure based on 1q4w

Ideal structure
Name: 2,6-diamino-3h-quinazolin-4-one
Formula: C8 H8 N4 O
Weight: 176.175
SMILES: "Nc1ccc2nc(N)nc(O)c2c1"
Spacial conformation based on PDB 1q4w.
Also present on 1r5y
RESIDUE   DQU     21
CONECT      C6     3 N4   C1   C5  
CONECT      N4     3 C6   HN41 HN42
CONECT      C1     3 C6   C2   H1  
CONECT      C2     3 C1   C3   H2  
CONECT      C3     3 C2   N3   C4  
CONECT      N3     2 C3   C8  
CONECT      C8     3 N3   N2   N1  
CONECT      N2     3 C8   HN21 HN22
CONECT      N1     2 C8   C7  
CONECT      C7     3 N1   O1   C4  
CONECT      O1     2 C7   HO1 
CONECT      C4     3 C3   C7   C5  
CONECT      C5     3 C6   C4   H5  
CONECT      HN41   1 N4  
CONECT      HN42   1 N4  
CONECT      H1     1 C1  
CONECT      H2     1 C2  
CONECT      HN21   1 N2  
CONECT      HN22   1 N2  
CONECT      HO1    1 O1  
CONECT      H5     1 C5  
END   
HET    DQU             21
HETSYN     DQU 2,6-DIAMINOQUINAZOLIN-4(3H)-ONE
HETNAM     DQU 2,6-DIAMINO-3H-QUINAZOLIN-4-ONE
FORMUL      DQU    C8 H8 N4 O1

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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