4'-demethylrebeccamycin + S-adenosyl-L-methionine = rebeccamycin + S-adenosyl-L-homocysteine + H(+)
4'-demethylrebeccamycin + s-adenosyl-l-methionine = rebeccamycin + s-adenosyl-l-homocysteine + h(+)
"demethylrebeccamycin-D-glucose O-methyltransferase"
"demethylrebeccamycin-d-glucose o-methyltransferase"