Hi RDKitters,

I wonder why the InChI strings generated by RDKit differ from the ones generated by the standard IUPAC inchi-1 executable.

I have used the IUPAC inchi-1 executable from a command line to generate IUPAC InChI strings (the executable that comes pre-built with the InChI 1.04 binary download).

RDKit InChI strings were generated with the RDKit KNIME nodes, this version:

     RDKit KNIME integration    2.1.0.201302211506

I constructed a KNIME workflow that reads in an SD-file, uses the "Molecule to RDKit" node and then the "RDKit To InChI" node with default options to generate RDKit InChI strings.

I ran the standard InChI example file Samples.sdf through the KNIME workflow and compared with the InChIs generated from the IUPAC executable. A number of InChI strings are different; it seems to be almost all stereo-related.

For example: InChI strings generated for spiro.mol (spiro.mol - attached):

IUPAC: InChI=1S/2C9H14Cl2/c2*1-7(10)3-9(4-7)5-8(2,11)6-9/h2*3-6H2,1-2H3/t2*7-,8-,9-/m10/s1
RDKit: InChI=1S/2C9H14Cl2/c2*1-7(10)3-9(4-7)5-8(2,11)6-9/h2*3-6H2,1-2H3

and stertaut.mol (stertaut.mol - attached):

IUPAC: InChI=1S/C6H6O5/c7-1-2-3(5(8)9)4(2)6(10)11/h1,3-4,7H,(H,8,9)(H,10,11)/b2-1-/t3-,4+/m0/s1 RDKit: InChI=1S/C6H6O5/c7-1-2-3(5(8)9)4(2)6(10)11/h1,3-4,7H,(H,8,9)(H,10,11)/t3-,4-/m1/s1

OK, now those InChI samples look like they are heavy on fringe cases and perhaps thus likely to really stress toolkits.

So I took something more peaceful and ran a peptide from PubChem through (pubchem_71296070.mol - attached).

IUPAC: InChI=1S/C33H55N9O10/c1-18(43)26(37)31(49)40-23(16-20-10-4-3-5-11-20)30(48)39-21(12-6-8-14-34)28(46)38-22(13-7-9-15-35)29(47)42-27(19(2)44)32(50)41-24(33(51)52)17-25(36)45/h3-5,10-11,18-19,21-24,26-27,43-44H,6-9,12-17,34-35,37H2,1-2H3,(H2,36,45)(H,38,46)(H,39,48)(H,40,49)(H,41,50)(H,42,47)(H,51,52)/t18-,19-,21+,22+,23+,24+,26+,27+/m1/s1 RDKit: InChI=1S/C33H55N9O10/c1-18(43)26(37)31(49)40-23(16-20-10-4-3-5-11-20)30(48)39-21(12-6-8-14-34)28(46)38-22(13-7-9-15-35)29(47)42-27(19(2)44)32(50)41-24(33(51)52)17-25(36)45/h3-5,10-11,18-19,21-24,26-27,43-44H,6-9,12-17,34-35,37H2,1-2H3,(H2,36,45)(H,38,46)(H,39,48)(H,40,49)(H,41,50)(H,42,47)(H,51,52)/t18-,19-,21+,22+,23+,24+,26+,27+/m0/s1

The "only" difference in this case is that IUPAC outputs an InChI string with /m0 and RDKit an InChI with /m1. As far as I can understand from the InChI FAQ the /m0 /m1 difference indicates that these are different enantiomers.

I converted the InChIs back to molecule with the "InChI to RDKit" KNIME node. The molecule generated from the IUPAC InChI (from-iupac-inchi.mol - attached) faithfully reconstructs the original PubChem molecule. When I construct a molecule from the RDKit InChI (from-rdkit-inchi.mol - attached), all the stereo centers have been inverted (as expected - different enantiomer).

Is there a good explanation for this ?

Cheers
-- Jan

71296070
  -OEChem-04201305312D

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   15.5918  -14.0466    0.0000 Cl  0  0  0  0  0  0  0  0  0  0  0  0
  3  2  1  0  0  0  0
  3  4  1  1  0  0  0
  1  3  1  0  0  0  0
  5  3  1  0  0  0  0
  6  1  1  0  0  0  0
  5  6  1  0  0  0  0
  7  6  1  0  0  0  0
  6  8  1  1  0  0  0
  9  7  1  0  0  0  0
  8  9  1  0  0  0  0
 10  9  1  0  0  0  0
  9 11  1  1  0  0  0
 14 13  1  0  0  0  0
 14 15  1  1  0  0  0
 12 14  1  0  0  0  0
 16 14  1  0  0  0  0
 17 12  1  0  0  0  0
 16 17  1  0  0  0  0
 18 17  1  0  0  0  0
 17 19  1  1  0  0  0
 20 18  1  0  0  0  0
 19 20  1  0  0  0  0
 21 20  1  0  0  0  0
 20 22  1  1  0  0  0
M  END
>  <NAME>
spiro 

$$$$




  -ISIS-  12270110152D

 11 11  0  0  0  0  0  0  0  0999 V2000
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    5.6630   -3.2662    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
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   -0.9930    0.5767    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    1.8201   -7.1090    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
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    3.2267   -9.5453    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
  2  1  1  0  0  0  0
  3  2  1  0  0  0  0
  3  1  1  0  0  0  0
  2  4  2  0  0  0  0
  5  4  1  0  0  0  0
  1  6  1  1  0  0  0
  7  6  1  0  0  0  0
  8  6  2  0  0  0  0
  3  9  1  1  0  0  0
 10  9  2  0  0  0  0
 11  9  1  0  0  0  0
M  END
>  <Name>
stertaut

$$$$




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M  END


  Mrv0541 04251323112D          

 52 52  0  0  0  0            999 V2000
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 33 51  2  0  0  0  0
 33 52  1  0  0  0  0
M  END


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