Catalysis of the reaction: 5-amino-6-(D-ribitylamino)uracil + 4-hydroxyphenylpyruvate + 2 S-adenosyl-L-methionine + H2O = 7,8-didemethyl-8-hydroxy-5-deazariboflavin + 2 5'-deoxyadenosine + 2 L-methionine + oxalate + ammonia + 4 H+.
Source:http://purl.uniprot.org/go/0044689
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