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In previously published articles , we evaluated the toxicity of four organophosphate ( OP ) pesticides ( dichlorvos , dimethoate , acephate and phorate ) to rats using metabonomic technology at their corresponding no observed adverse effect level ( NOAEL ) .
 Chemical: organophosphate; Chemical: dichlorvos; Chemical: dimethoate; Chemical: acephate; Chemical: phorate
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: organophosphate; Chemical: dichlorvos; Chemical: dimethoate; Chemical: acephate; Chemical: phorate