proatranorin III + S-adenosyl-L-methionine <=> atranorin + S-adenosyl-L-homocysteine
proatranorin iii + s-adenosyl-l-methionine <=> atranorin + s-adenosyl-l-homocysteine
proatranorin III + S-adenosyl-L-methionine <=> atranorin + S-adenosyl-L-homocysteine
proatranorin iii + s-adenosyl-l-methionine <=> atranorin + s-adenosyl-l-homocysteine