/usr/share/xdrawchem2/cyclobutane.cml is in xdrawchem 2.0-4.
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 | <?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE molecule SYSTEM "cml.dtd" []>
<molecule id="cyclobutane.cml" convention="CML-1999-05-15">
<string title="GenerationDate">Sun Sep 16 22:27:34 2001</string>
<string title="GenerationSoftware">XDrawChem 0.9</string>
<atom id="a0">
<string builtin="elementType">C</string>
<coordinate2 builtin="xy2">40 32</coordinate2>
<integer builtin="formalCharge">0</integer>
</atom>
<atom id="a1">
<string builtin="elementType">C</string>
<coordinate2 builtin="xy2">40 57</coordinate2>
<integer builtin="formalCharge">0</integer>
</atom>
<atom id="a2">
<string builtin="elementType">C</string>
<coordinate2 builtin="xy2">65 32</coordinate2>
<integer builtin="formalCharge">0</integer>
</atom>
<atom id="a3">
<string builtin="elementType">C</string>
<coordinate2 builtin="xy2">65 57</coordinate2>
<integer builtin="formalCharge">0</integer>
</atom>
<bond id="b0" atomRefs="a0 a1">
<string builtin="order">1</string>
</bond>
<bond id="b1" atomRefs="a0 a2">
<string builtin="order">1</string>
</bond>
<bond id="b2" atomRefs="a2 a3">
<string builtin="order">1</string>
</bond>
<bond id="b3" atomRefs="a3 a1">
<string builtin="order">1</string>
</bond>
</molecule>
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