Commodity2005200620072008
Heterocyclic comps. cont. an unfused imidazole ring (whether or not hydroge ...$1,197   
Heterocyclic comps. cont. an unfused pyridine ring (whether or not hydrogen ...$24,427$9,428  
Heterocyclic comps. cont. a pyrimidine ring (whether or not hydrogenated)/p ...  $565 
Melamine $5,668 $1,081
Heterocyclic comps. cont. an unfused triazine ring (whether or not hydrogen ...  $334 
Total$25,624$15,096$899$1,081