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