Structure based on 1dyr

Ideal structure
Name: trimethoprim
Formula: C14 H18 N4 O3
Weight: 290.318
SMILES: "COc1cc(Cc2cnc(N)nc2N)cc(OC)c1OC"
Spacial conformation based on PDB 1dyr.
Also present in other 28 PDB entries.
RESIDUE   TOP     39
CONECT      C1     3 N2   C8   H1  
CONECT      N2     2 C1   C3  
CONECT      C3     3 N2   N4   N5  
CONECT      N4     3 C3   HN41 HN42
CONECT      N5     2 C3   C6  
CONECT      C6     3 N5   N7   C8  
CONECT      N7     3 C6   HN71 HN72
CONECT      C8     3 C1   C6   C9  
CONECT      C9     4 C8   C10  H91  H92 
CONECT      C10    3 C9   C11  C21 
CONECT      C11    3 C10  C12  H11 
CONECT      C12    3 C11  O13  C15 
CONECT      O13    2 C12  C14 
CONECT      C14    4 O13  H141 H142 H143
CONECT      C15    3 C12  O16  C18 
CONECT      O16    2 C15  C17 
CONECT      C17    4 O16  H171 H172 H173
CONECT      C18    3 C15  O19  C21 
CONECT      O19    2 C18  C20 
CONECT      C20    4 O19  H201 H202 H203
CONECT      C21    3 C10  C18  H21 
CONECT      H1     1 C1  
CONECT      HN41   1 N4  
CONECT      HN42   1 N4  
CONECT      HN71   1 N7  
CONECT      HN72   1 N7  
CONECT      H91    1 C9  
CONECT      H92    1 C9  
CONECT      H11    1 C11 
CONECT      H141   1 C14 
CONECT      H142   1 C14 
CONECT      H143   1 C14 
CONECT      H171   1 C17 
CONECT      H172   1 C17 
CONECT      H173   1 C17 
CONECT      H201   1 C20 
CONECT      H202   1 C20 
CONECT      H203   1 C20 
CONECT      H21    1 C21 
END   
HET    TOP             39
HETNAM     TOP TRIMETHOPRIM
FORMUL      TOP    C14 H18 N4 O3

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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