Commodity20052006200920102011
Tetrahydrofuran$4,515   $124
Heterocyclic comps. cont. an unfused furan ring (whether or not hydrogenate ... $280   
Coumarin, methylcoumarins & ethylcoumarins   $740$768
Lactones (excl. coumarin, methylcoumarins & ethylcoumarins) $3,821$256 $147
Total$4,515$4,101$256$740$1,039