Convert chemical file format .

Recently I knew KCF file format. The format represents molecules as graph structure. And it is used in KEGG.
KCF uses atom label and orientation, and bond information.
RDKit or Openbabel can not convert sdf 2 kcf.

Someone who want to convert sdf to kcf. KEGG site provide us API for file format conversion.
Example is following.
I have a sdf file.

iwatobipen$ head cdk2.sdf 
ZINC03814457
                    3D
 Structure written by MMmdl.
 30 31  0  0  1  0            999 V2000
    5.4230   -0.4412    0.7616 C   0  0  0  0  0  0
    4.2434    0.3667    0.1880 C   0  0  0  0  0  0
    4.5978    0.9630   -1.1852 C   0  0  0  0  0  0
    2.9575   -0.4703    0.1074 C   0  0  0  0  0  0
    2.9988   -1.6999    0.0580 O   0  0  0  0  0  0
    1.6357    0.2975    0.0804 C   0  0  0  0  0  0

Know convert the file to kcf format using REST API.

iwatobipen$ curl -F sdffile=@cdk2.sdf http://rest.genome.jp/sdf2kcf/ > cdk2.kcf

iwatobipen$ head cdk2.kcf 
ENTRY       cdk21                       Compound
ATOM        17
            1   C1a C     5.4230   -0.4412
            2   C1c C     4.2434    0.3667
            3   C1a C     4.5978    0.9630
            4   C5a C     2.9575   -0.4703
            5   O5a O     2.9988   -1.6999
            6   C1b C     1.6357    0.2975
            7   O2a O     0.5374   -0.6063
            8   C8y C    -0.7229   -0.0532

API works fine. But if user want to convert large dataset, API is too slow.
I will try to make converter someday.

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