label: cytidine(4447) in 28S rRNA + S-adenosyl-L-methionine => 5-methylcytidine(4447) in 28S rRNA + S-adenosyl-L-homocysteine + H(+)
label_lc: cytidine(4447) in 28s rrna + s-adenosyl-l-methionine => 5-methylcytidine(4447) in 28s rrna + s-adenosyl-l-homocysteine + h(+)