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The gas phase reaction between methane sulfonic acid ( CH3SO3H ; MSA ) and the hydroxyl radical ( HO ) , without and with a water molecule , was investigated with DFT - B3LYP and CCSD ( T ) - F12 methods .
 Chemical: methane sulfonic acid; Chemical: CH3SO3H; Chemical: MSA; Chemical: hydroxyl; Chemical: HO
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: methane sulfonic acid; Chemical: CH3SO3H; Chemical: MSA; Chemical: hydroxyl; Chemical: HO