label: pseudouridine(1915) in 23S rRNA + S-adenosyl-L-methionine => N(3)-methylpseudouridine(1915) in 23S rRNA + S-adenosyl-L-homocysteine + H(+)
label_lc: pseudouridine(1915) in 23s rrna + s-adenosyl-l-methionine => n(3)-methylpseudouridine(1915) in 23s rrna + s-adenosyl-l-homocysteine + h(+)