When you add Hs to the molecule they are explicitly present in the molecular
graph. The SMILES code includes everything in the graph. This is why you end up
with [H]s in the SMILES.
-greg
_____________________________
From: Bennion, Brian <[email protected]>
Sent: Thursday, September 1, 2016 7:19 PM
Subject: RE: [Rdkit-discuss] protonating proper tertiary amines
To: Greg Landrum <[email protected]>
Cc: <[email protected]>
Hello All,
I just inserted the test smile string as shown in the code below. This should
just test the function and not how molecule information is passed to it. I can
see that the molecular formula is indeed updated for both formal charge and the
additional hydrogen atom. The bond order also seems correct. The sdf file looks
correct as well with the proper charge and 4 bonds on nitrogen.
However, a printing of the smiles string shows an odd placement of the Hydrogen
atom [N+]([H]) is not what I would expect....
The test output is:
Tertiary nitrogen found: ((1, 2, 3, 5),)
This is the symbol and charge for the tertiary nitrogen before: N 0 CCN(CC)CC
This is the symbol and charge for the tertiary nitrogen after: N 1
test3-10: SANITIZE_NONE C6H15N C6H15N+ C6H16N+ 4
[H]C([H])([H])C([H])([H])[N+]([H])(C([H])([H])C([H])([H])[H])C([H])([H])C([H])([H])[H]
test code
def tertNitrogenProt(molecule0,molName1,w_sdf,w_smi):
patt=rdkit.Chem.MolFromSmarts('[#6]-[#7]([#6])-[#6]')
molecule=rdkit.Chem.MolFromSmiles('CCN(CC)CC')
matches=molecule.GetSubstructMatches(patt)
tertNHnum=0
if matches:
print "Tertiary nitrogen found: ", matches
for i in matches:
moleculeStrings=rdkit.Chem.MolToSmiles(molecule,isomericSmiles=True)
molecule.UpdatePropertyCache()
atomSymbol9=molecule.GetAtomWithIdx(i[1]).GetSymbol()
formalCharge9=molecule.GetAtomWithIdx(i[1]).GetFormalCharge()
print "This is the symbol and charge for the tertiary nitrogen before:
",atomSymbol9,formalCharge9,moleculeStrings
#set the formal charge on the protonated tertiary nitrogen to zero
test7=rdkit.Chem.AllChem.CalcMolFormula(molecule)
molecule.GetAtomWithIdx(i[1]).SetFormalCharge(1)
atomSymbol9=molecule.GetAtomWithIdx(i[1]).GetSymbol()
formalCharge9=molecule.GetAtomWithIdx(i[1]).GetFormalCharge()
test8=rdkit.Chem.AllChem.CalcMolFormula(molecule)
print "This is the symbol and charge for the tertiary nitrogen after:
",atomSymbol9,formalCharge9
#update property cache and check for nonsense
molecule.UpdatePropertyCache()
moleculeH=rdkit.Chem.AddHs(molecule)
test3=rdkit.Chem.SanitizeMol(moleculeH)
test9=rdkit.Chem.AllChem.CalcMolFormula(moleculeH)
test10=moleculeH.GetAtomWithIdx(i[1]).GetDegree()
moleculeStrings2=rdkit.Chem.MolToSmiles(moleculeH,isomericSmiles=True)
print "test3-10: ",test3,test7,test8,test9,test10,moleculeStrings2
From: Greg Landrum [[email protected]]
Sent: Wednesday, August 31, 2016 7:49 PM
To: Bennion, Brian
Cc: [email protected]
Subject: Re: [Rdkit-discuss] protonating proper tertiary amines
On Thu, Sep 1, 2016 at 1:01 AM, Bennion, Brian <[email protected]> wrote:
On one compute node with one thread, two reagents are combined in a synthesis
function and then the tertNitrogenProt function is called and the current
molecule is passed through to be searched for the tertiary nitrogen and
protonated if found.
What I am not clear on, is whether the properties are passed properly from the
synthesis function to the tertNitrogenProt function.
Yeah, given that the function works correctly when it's called on its own, I
think the problem is likely to be in the way it's being called. Question, what
are the outputs of UpdatePropertyCache()? When I test for output, only the
word _none_ is printed. I don't know if that means there were no properties
present, or they did not need to be updated.
UpdatePropertyCache() doesn't return a value, that's why you're seeing None.
The method just causes the implicit properties on each of the molecule's atoms
to be re-computed, but it doesn't return anything.
-greg
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