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alpha - Amino - alpha ' - halomethylketones are interesting scaffolds bearing ( at least ) two sequential electrophilic carbons that by interacting with the nucleophilic moieties of several enzymes , represent the ideal candidates for in vivo and in vitro inhibition studies .
 Chemical: alpha - Amino - alpha ' - halomethylketones; Chemical: carbons
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: alpha - Amino - alpha ' - halomethylketones; Chemical: carbons