proatranorin I + S-adenosyl-L-homocysteine => 4-O-demethylbarbatate + S-adenosyl-L-methionine
proatranorin i + s-adenosyl-l-homocysteine => 4-o-demethylbarbatate + s-adenosyl-l-methionine
proatranorin I + S-adenosyl-L-homocysteine => 4-O-demethylbarbatate + S-adenosyl-L-methionine
proatranorin i + s-adenosyl-l-homocysteine => 4-o-demethylbarbatate + s-adenosyl-l-methionine