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Arsenic trioxide ( As2O3 ; ATO ) is clinically effective in treating acute promyelocytic leukemia ( APL ) ; however , it frequently causes cardiotoxic effects .
 Chemical: Arsenic trioxide; Chemical: As2O3; Chemical: ATO
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: Arsenic trioxide; Chemical: As2O3; Chemical: ATO