dihydrosterigmatocystin + S-adenosyl-L-methionine => 8-O-methyldihydrosterigmatocystin + S-adenosyl-L-homocysteine + H(+)
dihydrosterigmatocystin + s-adenosyl-l-methionine => 8-o-methyldihydrosterigmatocystin + s-adenosyl-l-homocysteine + h(+)