21722
Electron spin resonance spin trapping experiments indicated that both singlet oxygen and superoxide radical anion were generated from UVA photoirradiation of BPDE in a light dose responding manner .
 Chemical: oxygen; Chemical: superoxide; Chemical: BPDE
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: oxygen; Chemical: superoxide; Chemical: BPDE