18381
Arsenic trioxide ( As2O3 ) is an environmental toxicant and a potent antineoplastic agent .
 Chemical: Arsenic trioxide; Chemical: As2O3
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