xanthohumol + S-adenosyl-L-methionine <=> 4-O-methylxanthohumol + S-adenosyl-L-homocysteine + H(+)
xanthohumol + s-adenosyl-l-methionine <=> 4-o-methylxanthohumol + s-adenosyl-l-homocysteine + h(+)
xanthohumol + S-adenosyl-L-methionine <=> 4-O-methylxanthohumol + S-adenosyl-L-homocysteine + H(+)
xanthohumol + s-adenosyl-l-methionine <=> 4-o-methylxanthohumol + s-adenosyl-l-homocysteine + h(+)