label: a ribonucleotide in RNA + S-adenosyl-L-methionine => a 2'-O-methylribonucleotide in RNA + S-adenosyl-L-homocysteine + H(+)
label_lc: a ribonucleotide in rna + s-adenosyl-l-methionine => a 2'-o-methylribonucleotide in rna + s-adenosyl-l-homocysteine + h(+)