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Our efforts lead to the discovery of a novel agmatine dipeptide inhibitor ( compound 33 , IC50 2 . 6 +/- 0 . 3 mu M ) with improved inhibitory activity in comparison to the most potent inhibitor described in our recent report [ IC50 4 . 7 +/- 1 . 2 mu M ; Lim et al . , Eur . J . Med . Chem . 46 ( 2011 ) 3130 - 3134 ] .
 Chemical: agmatine dipeptide
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: agmatine dipeptide