2849
Additionally , elzasonan was shown to be metabolized to the novel cyclized indole metabolite ( M6 ) which undergoes subsequent oxidation to form the iminium ion metabolite ( M3a ) .
 elzasonan, indole, iminium
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 elzasonan, indole, iminium