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(+)