I am trying to compute Entalpy of formation (of alkanes at this time)
using group additivity.
For the sake of argument, let's use normal-propane (CCC)
I am currently running Open Babel 2.3.1 under win 7
>From what I have understood from the Open Babel documentation
(paragraph 6.11 calculate TPSA) it should be possible to add plugins
at runtime without recompile (and that is what I am trying to do)

My steps:
1 - Write the plugindefines.txt file
2 - Write the file containing my property using the sintax "group I am
looking for" TAB "number"
3 - Save both in the C:\Program Files (x86)\OpenBabel-2.3.1 folder

At the end of this message you can find copy of both plugindefines.txt
and HF_Groups.txt

What I expected was to get a new descriptor called HF_Try. When I look
for descriptors, there is nothing like HF_Try, as you can see from the
screenshot


C:\Users\Samu>obabel -L descriptors
abonds    Number of aromatic bonds
atoms    Number of atoms
bonds    Number of bonds
cansmi    Canonical SMILES
cansmiNS    Canonical SMILES without isotopes or stereo
dbonds    Number of double bonds
formula    Chemical formula
HBA1    Number of Hydrogen Bond Acceptors 1 (JoelLib)
HBA2    Number of Hydrogen Bond Acceptors 2 (JoelLib)
HBD    Number of Hydrogen Bond Donors (JoelLib)
InChI    IUPAC InChI identifier
InChIKey    InChIKey
L5    Lipinski Rule of Five
logP    octanol/water partition coefficient
MR    molar refractivity
MW    Molecular Weight filter
nF    Number of Fluorine Atoms
s    SMARTS filter
sbonds    Number of single bonds
smarts    SMARTS filter
tbonds    Number of triple bonds
title    For comparing a molecule's title
TPSA    topological polar surface area


Am I doing something wrong? Does my issue have anything to do with the
"obabel -L loaders" (about which I couldn't find any help)?
Thanks for the attention and the help

Samuele


plugindefines.txt:
OBGroupContrib
HF_Try          # name of descriptor
HF_Groups.txt   # data file
Compute Entalpy of formation using group additivity\n # brief description
Numbers are taken from Bozzelli work!


HF_Groups.txt:
[CH3(-CX4)]     11
[CH2(-CX4)(-CX4)]       111
[CH(-CX4)(-CX4)(-CX4)]  1111
[C(-CX4)(-CX4)(-CX4)(-CX4)]     11111

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