label: N(1)-methylpseudouridine(1248) in human 18S rRNA + S-adenosyl-L-methionine <=> N(1)-methyl-N(3)-[(3S)-3-amino-3-carboxypropyl]pseudouridine(1248) in human 18S rRNA + S-methyl-5'-thioadenosine + H(+)
label_lc: n(1)-methylpseudouridine(1248) in human 18s rrna + s-adenosyl-l-methionine <=> n(1)-methyl-n(3)-[(3s)-3-amino-3-carboxypropyl]pseudouridine(1248) in human 18s rrna + s-methyl-5'-thioadenosine + h(+)