<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE amino-acid SYSTEM "aminoacids.dtd">
<amino-acid>
   <name>Tryptophan</name>
   <abbreviation>trp</abbreviation>
   <symbol>w</symbol>
   <molecular-formula>C11H12N2O2</molecular-formula>
   <molecular-weight>204.23</molecular-weight>
   <isoelectric-point>5.89</isoelectric-point>
   <CAS-registry-number>73-22-3</CAS-registry-number>
</amino-acid>
