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perl -e '(@x)=$ARGV[0]=~/\[(.*?)\]/g; print qq|$x[$#x];\n|' "enoyl-[a +cyl-carrier-protein] reductase [NADH] 2 [Silicibacter sp. TrichCH4B]. + " #--output--- Silicibacter sp. TrichCH4B;
/\[([^\]]+)\]/