Hi Alex –  You could search 3,3',3''-phosphanetriyltripropanoic acid
[http://cdn.rcsb.org/etl/ligand/img/T/TCE/TCE-large.png]
Three letter code is “TCE”
3,3',3''-phosphanetriyltripropanoic acid

TCE as free ligands, exist in 13 
entries<http://www.rcsb.org/pdb/search/smartSubquery.do?smartSearchSubtype=ChemCompIdQuery&chemCompId=TCE&polymericType=Free>.
 Example includes: 
3T92<http://www.rcsb.org/pdb/explore/explore.do?structureId=3T92> 
5K08<http://www.rcsb.org/pdb/explore/explore.do?structureId=5K08> 
5T04<http://www.rcsb.org/pdb/explore/explore.do?structureId=5T04>
Hope this helps,
Gye Won

From: CCP4 bulletin board [mailto:[email protected]] On Behalf Of Alex Lee
Sent: Wednesday, October 18, 2017 5:20 PM
To: [email protected]
Subject: [ccp4bb] PDB ligand 3-letter code for TCEP?

Hi All,

I tried to look for the 3-letter ligand for reducing reagent TCEP in PDB but I 
could not find one.  I even search with "Tris(2-carboxyethyl)phosphine 
hydrochloride" in PDB but got right hit. How do I need to to to pull the TCEP 
code out?

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