/usr/share/RDKit/Contrib/mmpa/data/sample_smirks.txt is in rdkit-data 201603.5-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [*:2]c1ccc([*:1])o1>>[*:1]c1ccc([*:2])cc1 s1
[*:1]c1ccc([*:2])o1>>[*:2]c1ccc([*:1])cc1 s2
[*:1]c1ccc([*:2])o1>>[*:2]C1=CC=C([*:1])C=C1 s3
|