Structure based on 1dmj

Ideal structure
Name: 7-amino-3,3a,4,5-tetrahydro-8h-2-oxa-5,6,8,9b-tetraaza-cyclopenta[a]naphthalene-1,9-dione
Formula: C8 H9 N5 O3
Weight: 223.189
SMILES: "NC1=NC2=C(N3[CH](CN2)COC3=O)C(=O)N1"
Spacial conformation based on PDB 1dmj
RESIDUE   AP4     25
CONECT      N1     2 C2   C10 
CONECT      C2     3 N1   N2   N3  
CONECT      N2     3 C2   HN21 HN22
CONECT      N3     3 C2   C4   HN3 
CONECT      C4     3 N3   O4   C9  
CONECT      O4     1 C4  
CONECT      N5     3 C6   C9   C13 
CONECT      C6     4 N5   C7   C11  H6  
CONECT      C7     4 C6   N8   H71  H72 
CONECT      N8     3 C7   C10  HN8 
CONECT      C10    3 N1   N8   C9  
CONECT      C9     3 C4   N5   C10 
CONECT      C11    4 C6   O12  H111 H112
CONECT      O12    2 C11  C13 
CONECT      C13    3 N5   O12  O14 
CONECT      O14    1 C13 
CONECT      HN21   1 N2  
CONECT      HN22   1 N2  
CONECT      HN3    1 N3  
CONECT      H6     1 C6  
CONECT      H71    1 C7  
CONECT      H72    1 C7  
CONECT      HN8    1 N8  
CONECT      H111   1 C11 
CONECT      H112   1 C11 
END   
HET    AP4             25
HETSYN     AP4 5,6-CYCLIC-TETRAHYDROPTERIDINE
HETNAM     AP4 7-AMINO-3,3A,4,5-TETRAHYDRO-8H-2-OXA-5,6,8,9B-TETRAAZA-
HETNAM   2 AP4 CYCLOPENTA[A]NAPHTHALENE-1,9-DIONE
FORMUL      AP4    C8 H9 N5 O3

This OCA MONOMER page
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