label: GDGT-0 + AH2 + 2 S-adenosyl-L-methionine = GMGT-0 + 2 5'-deoxyadenosine + 2 L-methionine + A + 2 H(+)
label_lc: gdgt-0 + ah2 + 2 s-adenosyl-l-methionine = gmgt-0 + 2 5'-deoxyadenosine + 2 l-methionine + a + 2 h(+)