label: cytidine(1962) in 23S rRNA + S-adenosyl-L-methionine <=> 5-methylcytidine(1962) in 23S rRNA + S-adenosyl-L-homocysteine + H(+)
label_lc: cytidine(1962) in 23s rrna + s-adenosyl-l-methionine <=> 5-methylcytidine(1962) in 23s rrna + s-adenosyl-l-homocysteine + h(+)