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Exploiting catalytic promiscuity : The proline - based enzyme 4 - oxalocrotonate tautomerase ( 4 - OT ) promiscuously catalyzes asymmetric Michael - type additions of linear aldehydes - - ranging from acetaldehyde to octanal - - to trans - beta - nitrostyrene in aqueous solvent .
 Chemical: proline; Chemical: 4 - oxalocrotonate; Chemical: 4 - OT; Chemical: aldehydes; Chemical: acetaldehyde; Chemical: octanal; Chemical: trans - beta - nitrostyrene
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: proline; Chemical: 4 - oxalocrotonate; Chemical: 4 - OT; Chemical: aldehydes; Chemical: acetaldehyde; Chemical: octanal; Chemical: trans - beta - nitrostyrene