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Structure - activity relationship analysis of highly potent subtype - selective ligands ( MT ( 2 ) EC ( 50 ) 10 - 90 pM ) revealed that a benzyloxyl substituent incorporated at C6 position of the 3 - methoxyphenyl ring dramatically enhanced the MT ( 2 ) potency and at the same time decreased MT ( 1 ) potency .
 benzyloxyl, 3 - methoxyphenyl
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 benzyloxyl, 3 - methoxyphenyl