Structure based on 5k1i

Ideal structure
Name: 4-[(5-acetyl-2-ethyl-3-oxo-6-phenyl-2,3-dihydropyridazin-4-yl)amino]benzoic acid
Formula: C21 H19 N3 O4
Weight: 377.393
SMILES: "CCN1N=C(c2ccccc2)C(=C(Nc3ccc(cc3)C(O)=O)C1=O)C(C)=O"
Spacial conformation based on PDB 5k1i
RESIDUE   6PT     47
CONECT      C18    3 C17  C19  H1  
CONECT      C9     3 C10  C8   H2  
CONECT      C10    3 C9   C11  H3  
CONECT      C11    3 C10  C6   H4  
CONECT      C16    3 C15  C17  H5  
CONECT      C12    3 C13  C2   O1  
CONECT      C6     3 C11  C1   C7  
CONECT      C5     4 C4   H6   H7   H8  
CONECT      C20    3 O2   O3   C17 
CONECT      C3     3 N2   C21  C2  
CONECT      O2     1 C20 
CONECT      C13    4 C12  H9   H10  H11 
CONECT      N2     3 C3   C14  H12 
CONECT      C14    3 N2   C15  C19 
CONECT      C15    3 C16  C14  H13 
CONECT      O3     2 C20  H14 
CONECT      C17    3 C18  C16  C20 
CONECT      C19    3 C18  C14  H15 
CONECT      C21    3 C3   O4   N3  
CONECT      O4     1 C21 
CONECT      C2     3 C12  C3   C1  
CONECT      O1     1 C12 
CONECT      C1     3 C6   C2   N1  
CONECT      N1     2 C1   N3  
CONECT      N3     3 C21  N1   C4  
CONECT      C4     4 C5   N3   H16  H17 
CONECT      C8     3 C9   C7   H18 
CONECT      C7     3 C6   C8   H19 
CONECT      H1     1 C18 
CONECT      H2     1 C9  
CONECT      H3     1 C10 
CONECT      H4     1 C11 
CONECT      H5     1 C16 
CONECT      H6     1 C5  
CONECT      H7     1 C5  
CONECT      H8     1 C5  
CONECT      H9     1 C13 
CONECT      H10    1 C13 
CONECT      H11    1 C13 
CONECT      H12    1 N2  
CONECT      H13    1 C15 
CONECT      H14    1 O3  
CONECT      H15    1 C19 
CONECT      H16    1 C4  
CONECT      H17    1 C4  
CONECT      H18    1 C8  
CONECT      H19    1 C7  
END   
HET    6PT             47
HETNAM     6PT 4-[(5-acetyl-2-ethyl-3-oxo-6-phenyl-2,3-dihydropyridazi
HETNAM   2 6PT n-4-yl)amino]benzoic acid
FORMUL      6PT    C21 H19 N3 O4

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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