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more general categories information about this item 10. Biology and Chemistry 10. Biology and Chemistry Biology and Chemistry (144) Biochemistry (39) description: US EPA pesticide chemical codes (PC codes) identify chemical substances that are pesticides. They also identify bio-chemical substances (a.k.a. bio-pesticides), precise atomic varieties of conventional pesticides (i.e. formulations), and degradates formed from regulated pesticides. AFDSI created a EPA-PC ontology to integrate US EPA pesticide chemical substance data. complete name: US EPA Pesticide Codes