5500
A possible mechanism of acid - catalyzed degradation of compound 1 in methanol was proposed , consisting of a fast protonation , followed by a committed step of hydroxyl group removal .
 Chemical: methanol; Chemical: hydroxyl
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: methanol; Chemical: hydroxyl