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/usr/share/massxpert/pol-chem-defs/protein-3-letters/pdb-code-conversion.dic is in massxpert-data 3.6.1-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Converts from code on the left of '>' to code on the right.
# Number of letters allowed in each code is 
# described with syntax 1>3 and that line should be the first
# non-comment line in this file.
3>3
ALA>Ala
CYS>Cys
ASP>Asp
GLU>Glu
PHE>Phe
GLY>Gly
HIS>His
ILE>Ile
LYS>Lys
LEU>Leu
MET>Met
ASN>Asn
PRO>Pro
GLN>Gln
ARG>Arg
SER>Ser
THR>Thr
VAL>Val
TRP>Trp
TYR>Tyr