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Okadaic acid ( OKA ) and analogues are frequent contaminants of coastal waters and seafood .
 Chemical: Okadaic acid; Chemical: OKA
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: Okadaic acid; Chemical: OKA