label: cytidine(49) in tRNA + S-adenosyl-L-methionine => 5-methylcytidine(49) in tRNA + S-adenosyl-L-homocysteine + H(+)
label_lc: cytidine(49) in trna + s-adenosyl-l-methionine => 5-methylcytidine(49) in trna + s-adenosyl-l-homocysteine + h(+)