18808
Herein we report the crystallographic structures of a series of structurally related metastable Mn ( III ) - OOR compounds , and examine their spectroscopic and reactivity properties .
 Chemical: Mn ( III ) - OOR
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: Mn ( III ) - OOR