27458
Results of high - precision fitting of the second - harmonic EPR spectra of the small spin probe di - tert - butyl nitroxide ( DTBN ) in these aggregates together with viscosity , conductivity , and DLS showed that , at pH ~ 7 . 54 , MTNa formed micelles and MPNa vesicles and MTNa exhibited a pH - induced micelle to vesicle transition as pH was lowered toward 6 .
 Chemical: di - tert - butyl nitroxide; Chemical: DTBN
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: di - tert - butyl nitroxide; Chemical: DTBN