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IOP experiments showed that the administration of timolol in rabbits pre - treated with melatonin or 5 - MCA - NAT evoked an additional IOP reduction of 14 . 02 +/- 5 . 8 % or 16 . 75 +/- 5 . 48 % ( p < 0 . 01 ) in comparison with rabbits treated with timolol alone for 24 hours .
 Chemical: timolol; Chemical: melatonin; Chemical: 5 - MCA - NAT; Chemical: timolol
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: timolol; Chemical: melatonin; Chemical: 5 - MCA - NAT; Chemical: timolol