preferred_name: 2-methylsulfanyl-N(6)-dimethylallyladenosine(37) in tRNA + [sulfur carrier]-H + 5'-deoxyadenosine + L-methionine + A + S-adenosyl-L-homocysteine + 2 H(+) => N(6)-dimethylallyladenosine(37) in tRNA + [sulfur carrier]-SH + AH2 + 2 S-adenosyl-L-methionine