label: an N(6)-methyl-2'-O-methyladenosine in U2 snRNA + S-adenosyl-L-homocysteine + H(+) => a 2'-O-methyladenosine in U2 snRNA + S-adenosyl-L-methionine
label_lc: an n(6)-methyl-2'-o-methyladenosine in u2 snrna + s-adenosyl-l-homocysteine + h(+) => a 2'-o-methyladenosine in u2 snrna + s-adenosyl-l-methionine