Commodity200520062007
Tetrahydrofuran$3$143 
Heterocyclic comps. cont. an unfused furan ring (whether or not hydrogenate ...  $100
Coumarin, methylcoumarins & ethylcoumarins $905 
Lactones (excl. coumarin, methylcoumarins & ethylcoumarins)$1,338 $1,176
Total$1,341$1,048$1,276