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Viability of 661W after light treatment for 24h , assessed by the tetrazolium salt ( WST - 8 ) assay and Hoechst 33342 nuclear staining , was improved by addition of MBE , D3G5G , and D3S5G .
 Chemical: tetrazolium; Chemical: Hoechst 33342; Chemical: D3G5G; Chemical: D3S5G
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: tetrazolium; Chemical: Hoechst 33342; Chemical: D3G5G; Chemical: D3S5G