<compounds>
   <compound CASRN="630-08-0">
     <name>Carbon monoxide</name>
     <formula>CO</formula>
   </compound>
   <compound CASRN="1333-74-0">
     <name>Hydrogen</name>
     <formula>H2</formula>
   </compound>
   <compound CASRN="74-98-6">
     <name>Propane</name>
     <formula>C3H8</formula>
   </compound>
   <compound CASRN="115-07-1">
     <name>Propene</name>
     <name>1-propene</name>
     <name>propylene</name>
     <formula>C3H6</formula>
   </compound>
   <compound CASRN="74-86-2">
     <name>Acetylene</name>
     <name>ethyne</name>
     <formula>C2H2</formula>
   </compound>
 </compounds>