<?xml version="1.0" encoding="UTF-8" ?>
<sbml level="3" version="1" xmlns="http://www.sbml.org/sbml/level3/version1/core">
 <model extentUnits="mole" timeUnits="second" conversionFactor="convertToMilliMole">
   <listOfUnitDefinitions>
     <unitDefinition id="mole_per_millimole_second">
       <listOfUnits>
        <unit kind="mole"   exponent="1"  scale="0"  multiplier="1" />
        <unit kind="mole"   exponent="-1" scale="-3" multiplier="1" />
        <unit kind="second" exponent="-1" scale="0"  multiplier="1" />
       </listOfUnits>
     </unitDefinition>
     <unitDefinition id="mole_litre_per_millimole_sq_second">
       <listOfUnits>
         <unit kind="mole"   exponent="1"  scale="0"  multiplier="1" />
         <unit kind="litre"  exponent="1"  scale="0"  multiplier="1" />
         <unit kind="mole"   exponent="-2" scale="-3" multiplier="1" />
         <unit kind="second" exponent="-1" scale="0"  multiplier="1" />
        </listOfUnits>
     </unitDefinition>
     <unitDefinition id="millimole">
       <listOfUnits>
         <unit kind="mole" exponent="1" scale="-3" multiplier="1"/>
       </listOfUnits>
     </unitDefinition>
     <unitDefinition id="gram_per_mole">
       <listOfUnits>
        <unit kind="gram" exponent="1"  scale="0" multiplier="1"/>
        <unit kind="mole" exponent="-1" scale="0" multiplier="1"/>
       </listOfUnits>
     </unitDefinition>
     <unitDefinition id="millimole_per_mole">
       <listOfUnits>
        <unit kind="mole" exponent="1"  scale="-3" multiplier="1"/>
        <unit kind="mole" exponent="-1" scale="0" multiplier="1"/>
       </listOfUnits>
     </unitDefinition>
   </listOfUnitDefinitions>
   <listOfCompartments>
     <compartment id="comp" size="1e-14" spatialDimensions="3" units="litre" constant="true" />
   </listOfCompartments>
   <listOfSpecies>
     <species compartment="comp" id="ES" initialAmount="0" boundaryCondition="false" 
              hasOnlySubstanceUnits="false" substanceUnits="millimole" constant="false" />
     <species compartment="comp" id="P" initialAmount="0" boundaryCondition="false" 
              hasOnlySubstanceUnits="false" substanceUnits="gram" constant="false" 
              conversionFactor="convertToGram"/>
     <species compartment="comp" id="S" initialAmount="1e-17" boundaryCondition="false" 
              hasOnlySubstanceUnits="false" substanceUnits="millimole" constant="false" />
     <species compartment="comp" id="E" initialAmount="5e-18" boundaryCondition="false" 
              hasOnlySubstanceUnits="false" substanceUnits="millimole" constant="false" />
   </listOfSpecies>
   <listOfParameters>
     <parameter id="convertToMilliMole" value="1000" units="millimole_per_mole" constant="true"/>
     <parameter id="convertToGram"      value="180"  units="gram_per_mole"      constant="true"/>
   </listOfParameters>
   <listOfReactions>
     <reaction id="veq" reversible="true" fast="false">
       <listOfReactants>
         <speciesReference species="E" stoichiometry="1" constant="true" />
         <speciesReference species="S" stoichiometry="1" constant="true" />
       </listOfReactants>
       <listOfProducts>
         <speciesReference species="ES" stoichiometry="1" constant="true" />
       </listOfProducts>
       <kineticLaw>
         <math xmlns="http://www.w3.org/1998/Math/MathML">
           <apply>
             <times />
             <ci>comp</ci>
             <apply>
               <minus /> 
               <apply> <times /> <ci> kon </ci> <ci> E </ci> <ci> S </ci> </apply>
               <apply> <times /> <ci> koff </ci> <ci> ES </ci> </apply>
             </apply>
           </apply>
         </math>
         <listOfLocalParameters>
           <localParameter id="kon"  value="1"      units="mole_litre_per_millimole_sq_second" />
           <localParameter id="koff" value="0.0002" units="mole_per_millimole_second" />
         </listOfLocalParameters>
       </kineticLaw>
     </reaction>
     <reaction id="vcat" reversible="false" fast="false">
       <listOfReactants>
         <speciesReference species="ES" stoichiometry="1" constant="true" />
       </listOfReactants>
       <listOfProducts>
         <speciesReference species="E" stoichiometry="1" constant="true" />
         <speciesReference species="P" stoichiometry="1" constant="true" />
       </listOfProducts>
       <kineticLaw>
         <math xmlns="http://www.w3.org/1998/Math/MathML">
           <apply>
             <times /> <ci> comp </ci> <ci> kcat </ci> <ci> ES </ci>
           </apply>
         </math>
         <listOfLocalParameters>
           <localParameter id="kcat" value="0.0001" units="mole_per_millimole_second" />
         </listOfLocalParameters>
       </kineticLaw>
     </reaction>
   </listOfReactions>
 </model>
</sbml>
