label: a 5'-end (N(2),N(7)-dimethyl 5'-triphosphoguanosine)-ribonucleoside in snRNA + S-adenosyl-L-homocysteine + H(+) => a 5'-end (N(7)-methyl 5'-triphosphoguanosine)-ribonucleoside in snRNA + S-adenosyl-L-methionine
label_lc: a 5'-end (n(2),n(7)-dimethyl 5'-triphosphoguanosine)-ribonucleoside in snrna + s-adenosyl-l-homocysteine + h(+) => a 5'-end (n(7)-methyl 5'-triphosphoguanosine)-ribonucleoside in snrna + s-adenosyl-l-methionine