content_image/930185.jpg
a phenol represented by the general formula 

<img src='content_image/930185.jpg'>

wherein R$^{1}$-R 5 are an aliphatic or aromatic optionally substituted organic radical; 

an aminium salt; 

an amphoteric hydroxide; 

a polyprotic organic acid; and 

an organic acid having a vapor pressure less than that of acetic acid. 

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