28422
Subsequently , a porphyrin derivative is synthesized as an SOD mimic , and is employed to construct a synergistic dual enzyme system by crosslinking Se - Fn nanocomposites into a microgel .
 Chemical: porphyrin; Chemical: Se
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: porphyrin; Chemical: Se