15269
The photothermal tautomerization processes between enol and keto forms of 4 - tert - butyl - 4 ' - methoxydibenzoylmethane ( trade name , Avobenzone ) in acetonitrile have been studied by steady - state and laser flash photolysis .
 Chemical: enol; Chemical: keto; Chemical: 4 - tert - butyl - 4 ' - methoxydibenzoylmethane; Chemical: Avobenzone; Chemical: acetonitrile
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: enol; Chemical: keto; Chemical: 4 - tert - butyl - 4 ' - methoxydibenzoylmethane; Chemical: Avobenzone; Chemical: acetonitrile