preferred_name: a guanosine in mRNA + S-adenosyl-L-methionine => an N(7)-methylguanosine in mRNA + S-adenosyl-L-homocysteine
preferred_name_lc: a guanosine in mrna + s-adenosyl-l-methionine => an n(7)-methylguanosine in mrna + s-adenosyl-l-homocysteine
label: a guanosine in mRNA + S-adenosyl-L-methionine => an N(7)-methylguanosine in mRNA + S-adenosyl-L-homocysteine
label_lc: a guanosine in mrna + s-adenosyl-l-methionine => an n(7)-methylguanosine in mrna + s-adenosyl-l-homocysteine