/usr/share/openbabel/2.3.2/plugindefines.txt is in libopenbabel4v5 2.3.2+dfsg-3build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 | # Data file for OBDefinable class.
# A # in the first column or a # followed by whitespace introduces a comment and
# the rest of the characters on a line are ignored.
# White space is trimmed from the front and back of the line.
#
# There can be any number of lines containing only whitespace and
# comment between objects, but none within an object.
# Lines which have "\n" at the end have this replaced by a new line
# character and the next line is concatenated.
#SmartsDescriptor
#nHal # name of descriptor. Use for example --filter "nHal<3"
#[F,Cl,Br,I,At] # SMARTS defining the descriptor
#Number of halogen atoms\n #This comment has two lines because of \n at the end.
#count fluorine, chlorine, etc. #When listing plugins, use verbose option to see lines after the first
#OpTransform # Description() for the class includes a line "OpTransform is definable"
#tautomers # ID. Commandline option to invoke is --tautomers
#tautomers.txt # Datafile containing transforms. If filename is * the data follows later in the entry.
#Replace tautomers with their standard forms. Not reliable at present. # An explanatory description.
#OpTransform
#nodative # ID. Commandline option to invoke is --nodative
#* # There is no datafile; the transforms are at the end of the entry
#Replace [N+]([O-])=O by N(=O)=O
#TRANSFORM [N+:1](=O)[O-:2] >> [N:1](=O)=[O:2]
CompoundFilter
L5 # ID
HBD<5 HBA1<10 MW<500 logP<5 # definition in terms of other descriptors or properties
Lipinski Rule of Five # description
PatternFP
MACCS # ID of this fingerprint type
MACCS.txt # File containing the SMARTS patterns
SmartsDescriptor
sbonds
*-*
Number of single bonds
SmartsDescriptor
dbonds
*=*
Number of double bonds
SmartsDescriptor
tbonds
*#*
Number of triple bonds
SmartsDescriptor
abonds
*:*
Number of aromatic bonds
SmartsDescriptor
bonds
*~*
Number of bonds\n
Add or remove hydrogens to count total or bonds between heavy atoms
SmartsDescriptor
atoms
*
Number of atoms\n
Add or remove hydrogens to count total or heavy atoms
OBGroupContrib
MP # name of descriptor
mpC.txt # data file
Melting point\n # brief description
This is a melting point descriptor developed\n # longer description
by Andy Lang. For details see:\n
http://onschallenge.wikispaces.com/MeltingPointModel011
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