Structure based on 4jpg

Ideal structure
Name: 2-(1h-benzimidazol-1-ylmethyl)-4h-pyrido[1,2-a]pyrimidin-4-one
Formula: C16 H12 N4 O
Weight: 276.293
SMILES: "O=C1C=C(Cn2cnc3ccccc23)N=C4C=CC=CN14"
Spacial conformation based on PDB 4jpg
RESIDUE   1OX     33
CONECT      C1     3 C2   C3   H1  
CONECT      C2     3 C1   C4   H2  
CONECT      C3     3 C1   C6   H3  
CONECT      C4     3 C2   C7   H4  
CONECT      C5     3 N17  N19  H5  
CONECT      C6     3 C3   C7   N17 
CONECT      C7     3 C4   C6   N19 
CONECT      C8     3 C9   C10  H6  
CONECT      C9     3 C8   C14  H7  
CONECT      C10    3 C8   C12  H8  
CONECT      C11    3 C13  C15  H9  
CONECT      C12    3 C10  N20  H11 
CONECT      C13    3 C11  C16  N18 
CONECT      C14    3 C9   N18  N20 
CONECT      C15    3 C11  N20  O21 
CONECT      C16    4 C13  N19  H12  H13 
CONECT      N17    2 C5   C6  
CONECT      N18    2 C13  C14 
CONECT      N19    3 C5   C7   C16 
CONECT      N20    3 C12  C14  C15 
CONECT      O21    1 C15 
CONECT      H1     1 C1  
CONECT      H2     1 C2  
CONECT      H3     1 C3  
CONECT      H4     1 C4  
CONECT      H5     1 C5  
CONECT      H6     1 C8  
CONECT      H7     1 C9  
CONECT      H8     1 C10 
CONECT      H9     1 C11 
CONECT      H11    1 C12 
CONECT      H12    1 C16 
CONECT      H13    1 C16 
END   
HET    1OX             33
HETNAM     1OX 2-(1H-benzimidazol-1-ylmethyl)-4H-pyrido[1,2-a]pyrimidi
HETNAM   2 1OX n-4-one
FORMUL      1OX    C16 H12 N4 O1

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