The problem isn't that atom it's S2 which has a lower case s as the atomic 
symbol. This should work.

@<TRIPOS>MOLECULE
56
   56    57     1     0     0
SMALL
No Charge or Current Charge


@<TRIPOS>ATOM
      1 O1        185.3370   -1.2940   41.4720 O.2       1 MOL     -0.561400
      2 S1        185.7170   -1.1200   40.1020 S.3       1 MOL      1.168300
      3 O2        186.5760   -0.0520   39.6890 O.2       1 MOL     -0.561400
      4 C7        184.2740   -1.0090   39.1500 C.3       1 MOL     -0.519100
      5 H6        183.7180   -1.9350   39.2880 H         1 MOL      0.174600
      6 H7        183.7170   -0.1510   39.5210 H         1 MOL      0.174600
      7 H8        184.5630   -0.8570   38.1080 H         1 MOL      0.174600
      8 N1        186.2420   -2.5640   39.4880 N.3       1 MOL     -0.663100
      9 H5        185.7910   -2.5910   38.5910 H         1 MOL      0.342600
     10 C5        187.5810   -2.6860   39.3790 C.ar      1 MOL      0.400800
     11 C6        188.3570   -2.9100   40.5080 C.ar      1 MOL     -0.263400
     12 C1        189.7410   -3.0320   40.3880 C.ar      1 MOL     -0.211300
     13 H1        190.3340   -3.2080   41.2810 H         1 MOL      0.169200
     14 H4        187.8790   -2.9910   41.4810 H         1 MOL      0.188700
     15 C4        188.1790   -2.5970   38.1250 C.ar      1 MOL     -0.263400
     16 H3        187.5740   -2.4410   37.2360 H         1 MOL      0.188700
     17 C3        189.5670   -2.6730   38.0080 C.ar      1 MOL     -0.211300
     18 H2        190.0410   -2.5530   37.0340 H         1 MOL      0.169200
     19 C2        190.3550   -2.8940   39.1370 C.ar      1 MOL      0.066300
     20 C8        191.8610   -2.9700   38.9500 C.3       1 MOL     -0.097700
     21 H9        192.0950   -3.8820   38.3980 H         1 MOL      0.062100
     22 H10       192.1620   -2.1510   38.2990 H         1 MOL      0.062100
     23 C9        192.7200   -2.9500   40.2260 C.3       1 MOL      0.137500
     24 H11       192.4490   -3.8260   40.8230 H         1 MOL      0.020500
     25 H12       193.7680   -3.0340   39.9420 H         1 MOL      0.020500
     26 N2        192.5120   -1.7100   41.0170 N.3       1 MOL     -0.391700
     27 C10       192.8750   -1.8910   42.4390 C.3       1 MOL     -0.010500
     28 H13       192.5690   -1.0190   43.0170 H         1 MOL      0.053900
     29 H14       192.3570   -2.7590   42.8510 H         1 MOL      0.053900
     30 H15       193.9520   -2.0370   42.5450 H         1 MOL      0.053900
     31 C11       193.1530   -0.5120   40.4040 C.3       1 MOL     -0.261800
     32 H16       194.2330   -0.5440   40.5530 H         1 MOL      0.126000
     33 H17       192.9670   -0.5070   39.3340 H         1 MOL      0.126000
     34 C12       192.6130    0.8290   40.9290 C.3       1 MOL      0.600200
     35 H18       192.6080    0.8470   42.0180 H         1 MOL     -0.077700
     36 H19       191.6020    1.0090   40.5550 H         1 MOL     -0.077700
     37 O3        193.5060    1.8730   40.4990 O.3       1 MOL     -0.520900
     38 C16       193.1590    2.6170   39.4070 C.ar      1 MOL      0.466000
     39 C17       193.2050    2.0860   38.1230 C.ar      1 MOL     -0.351200
     40 C18       192.8510    2.8760   37.0240 C.ar      1 MOL     -0.194300
     41 H23       192.9040    2.4540   36.0250 H         1 MOL      0.190200
     42 H22       193.5390    1.0680   37.9730 H         1 MOL      0.185000
     43 C15       192.7790    3.9400   39.5900 C.ar      1 MOL     -0.351200
     44 H21       192.7650    4.3400   40.5950 H         1 MOL      0.185000
     45 C14       192.4310    4.7360   38.4930 C.ar      1 MOL     -0.194300
     46 H20       192.1510    5.7760   38.6460 H         1 MOL      0.190200
     47 C13       192.4470    4.2020   37.2040 C.ar      1 MOL      0.318600
     48 N3        192.1310    5.0130   36.1600 N.3       1 MOL     -0.708800
     49 H24       191.7160    5.8940   36.4060 H         1 MOL      0.373500
     50 S2        191.1040    4.5350   34.9520 S.3       1 MOL      1.204100
     51 O5        190.4610    3.2930   35.2520 O.2       1 MOL     -0.577800
     52 C19       192.2620    4.2850   33.6910 C.3       1 MOL     -0.528100
     53 H25       191.7040    4.0120   32.7980 H         1 MOL      0.176400
     54 H26       192.9290    3.4880   34.0090 H         1 MOL      0.176400
     55 H27       192.7940    5.2260   33.5650 H         1 MOL      0.176400
     56 O4        190.3350    5.6910   34.6150 O.2       1 MOL     -0.577800
@<TRIPOS>BOND
     1   52   53 1
     2   52   54 1
     3   52   55 1
     4   50   51 1
     5   50   52 1
     6   50   56 1
     7   48   49 1
     8   48   50 1
     9   47   48 1
    10   45   46 1
    11   45   47 ar
    12   43   44 1
    13   43   45 ar
    14   40   41 1
    15   40   47 ar
    16   39   40 ar
    17   39   42 1
    18   38   39 ar
    19   38   43 ar
    20   37   38 1
    21   34   35 1
    22   34   36 1
    23   34   37 1
    24   31   32 1
    25   31   33 1
    26   31   34 1
    27   27   28 1
    28   27   29 1
    29   27   30 1
    30   26   27 1
    31   26   31 1
    32   23   24 1
    33   23   25 1
    34   23   26 1
    35   20   21 1
    36   20   22 1
    37   20   23 1
    38   19   20 1
    39   17   18 1
    40   17   19 ar
    41   15   16 1
    42   15   17 ar 
    43   12   13 1  
    44   12   19 ar 
    45   11   12 ar 
    46   11   14 1  
    47   10   11 ar 
    48   10   15 ar 
    49    8    9 1  
    50    8   10 1  
    51    4    5 1  
    52    4    6 1
    53    4    7 1
    54    2    3 1
    55    2    4 1
    56    2    8 1
    57    1    2 1
@<TRIPOS>SUBSTRUCTURE
     1 MOL         1 TEMP              0 ****  ****    0 ROOT


Best,
Nick

Nicholas C. Firth | PhD Student | Cancer Therapeutics
The Institute of Cancer Research | 15 Cotswold Road | Belmont | Sutton | Surrey 
| SM2 5NG
T 020 8722 4033 | E [email protected] | W www.icr.ac.uk | Twitter 
@ICRnews

________________________________________
From: Wong, Sergio E. [[email protected]]
Sent: 04 August 2014 21:37
To: [email protected]
Subject: [Rdkit-discuss] can not read in sulfur in mol2 file

Hi;

   I am using the RDkit python libraries to read in a mol2 file and create a 
molecule.  The code reads:

mol = Chem.MolFromMol2File("FILENAME")

I get the following error message:

****
Post-condition Violation
Element 's' not found
Violation occurred on line 91 in file 
/home/wong105/usr/RDKit/Code/GraphMol/PeriodicTable.h
Failed Expression: anum>-1
****

Any suggestions?  The mol2 file is shown below.  The sulfur atom is S1 (number 
2) in the file.

Thanks;
-Sergio


@<TRIPOS>MOLECULE
56
   56    57     1     0     0
SMALL
No Charge or Current Charge


@<TRIPOS>ATOM
      1 O1        185.3370   -1.2940   41.4720 O.2       1 MOL     -0.561400
      2 S1        185.7170   -1.1200   40.1020 S.3       1 MOL      1.168300
      3 O2        186.5760   -0.0520   39.6890 O.2       1 MOL     -0.561400
      4 C7        184.2740   -1.0090   39.1500 C.3       1 MOL     -0.519100
      5 H6        183.7180   -1.9350   39.2880 H         1 MOL      0.174600
      6 H7        183.7170   -0.1510   39.5210 H         1 MOL      0.174600
      7 H8        184.5630   -0.8570   38.1080 H         1 MOL      0.174600
      8 N1        186.2420   -2.5640   39.4880 N.3       1 MOL     -0.663100
      9 H5        185.7910   -2.5910   38.5910 H         1 MOL      0.342600
     10 C5        187.5810   -2.6860   39.3790 C.ar      1 MOL      0.400800
     11 C6        188.3570   -2.9100   40.5080 C.ar      1 MOL     -0.263400
     12 C1        189.7410   -3.0320   40.3880 C.ar      1 MOL     -0.211300
     13 H1        190.3340   -3.2080   41.2810 H         1 MOL      0.169200
     14 H4        187.8790   -2.9910   41.4810 H         1 MOL      0.188700
     15 C4        188.1790   -2.5970   38.1250 C.ar      1 MOL     -0.263400
     16 H3        187.5740   -2.4410   37.2360 H         1 MOL      0.188700
     17 C3        189.5670   -2.6730   38.0080 C.ar      1 MOL     -0.211300
     18 H2        190.0410   -2.5530   37.0340 H         1 MOL      0.169200
     19 C2        190.3550   -2.8940   39.1370 C.ar      1 MOL      0.066300
     20 C8        191.8610   -2.9700   38.9500 C.3       1 MOL     -0.097700
     21 H9        192.0950   -3.8820   38.3980 H         1 MOL      0.062100
     22 H10       192.1620   -2.1510   38.2990 H         1 MOL      0.062100
     23 C9        192.7200   -2.9500   40.2260 C.3       1 MOL      0.137500
     24 H11       192.4490   -3.8260   40.8230 H         1 MOL      0.020500
     25 H12       193.7680   -3.0340   39.9420 H         1 MOL      0.020500
     26 N2        192.5120   -1.7100   41.0170 N.3       1 MOL     -0.391700
     27 C10       192.8750   -1.8910   42.4390 C.3       1 MOL     -0.010500
     28 H13       192.5690   -1.0190   43.0170 H         1 MOL      0.053900
     29 H14       192.3570   -2.7590   42.8510 H         1 MOL      0.053900
     30 H15       193.9520   -2.0370   42.5450 H         1 MOL      0.053900
     31 C11       193.1530   -0.5120   40.4040 C.3       1 MOL     -0.261800
     32 H16       194.2330   -0.5440   40.5530 H         1 MOL      0.126000
     33 H17       192.9670   -0.5070   39.3340 H         1 MOL      0.126000
     34 C12       192.6130    0.8290   40.9290 C.3       1 MOL      0.600200
     35 H18       192.6080    0.8470   42.0180 H         1 MOL     -0.077700
     36 H19       191.6020    1.0090   40.5550 H         1 MOL     -0.077700
     37 O3        193.5060    1.8730   40.4990 O.3       1 MOL     -0.520900
     38 C16       193.1590    2.6170   39.4070 C.ar      1 MOL      0.466000
     39 C17       193.2050    2.0860   38.1230 C.ar      1 MOL     -0.351200
     40 C18       192.8510    2.8760   37.0240 C.ar      1 MOL     -0.194300
     41 H23       192.9040    2.4540   36.0250 H         1 MOL      0.190200
     42 H22       193.5390    1.0680   37.9730 H         1 MOL      0.185000
     43 C15       192.7790    3.9400   39.5900 C.ar      1 MOL     -0.351200
     44 H21       192.7650    4.3400   40.5950 H         1 MOL      0.185000
     45 C14       192.4310    4.7360   38.4930 C.ar      1 MOL     -0.194300
     46 H20       192.1510    5.7760   38.6460 H         1 MOL      0.190200
     47 C13       192.4470    4.2020   37.2040 C.ar      1 MOL      0.318600
     48 N3        192.1310    5.0130   36.1600 N.3       1 MOL     -0.708800
     49 H24       191.7160    5.8940   36.4060 H         1 MOL      0.373500
     50 S2        191.1040    4.5350   34.9520 s.3       1 MOL      1.204100
     51 O5        190.4610    3.2930   35.2520 O.2       1 MOL     -0.577800
     52 C19       192.2620    4.2850   33.6910 C.3       1 MOL     -0.528100
     53 H25       191.7040    4.0120   32.7980 H         1 MOL      0.176400
     54 H26       192.9290    3.4880   34.0090 H         1 MOL      0.176400
     55 H27       192.7940    5.2260   33.5650 H         1 MOL      0.176400
     56 O4        190.3350    5.6910   34.6150 O.2       1 MOL     -0.577800
@<TRIPOS>BOND
     1   52   53 1
     2   52   54 1
     3   52   55 1
     4   50   51 1
     5   50   52 1
     6   50   56 1
     7   48   49 1
     8   48   50 1
     9   47   48 1
    10   45   46 1
    11   45   47 ar
    12   43   44 1
    13   43   45 ar
    14   40   41 1
    15   40   47 ar
    16   39   40 ar
    17   39   42 1
    18   38   39 ar
    19   38   43 ar
    20   37   38 1
    21   34   35 1
    22   34   36 1
    23   34   37 1
    24   31   32 1
    25   31   33 1
    26   31   34 1
    27   27   28 1
    28   27   29 1
    29   27   30 1
    30   26   27 1
    31   26   31 1
    32   23   24 1
    33   23   25 1
    34   23   26 1
    35   20   21 1
    36   20   22 1
    37   20   23 1
    38   19   20 1
    39   17   18 1
    40   17   19 ar
    41   15   16 1
    42   15   17 ar
    43   12   13 1
    44   12   19 ar
    45   11   12 ar
    46   11   14 1
    47   10   11 ar
    48   10   15 ar
    49    8    9 1
    50    8   10 1
    51    4    5 1
    52    4    6 1
    53    4    7 1
    54    2    3 1
    55    2    4 1
    56    2    8 1
    57    1    2 1
@<TRIPOS>SUBSTRUCTURE
     1 MOL         1 TEMP              0 ****  ****    0 ROOT

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