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Melatonin and its analogue 5 - MCA - NAT potentiate adrenergic receptor - mediated ocular hypotensive effects in rabbits : Significance for combination therapy in glaucoma .
 Chemical: Melatonin; Chemical: 5 - MCA - NAT
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: Melatonin; Chemical: 5 - MCA - NAT