carminomycin + S-adenosyl-L-methionine = daunorubicin + S-adenosyl-L-homocysteine + H(+)
carminomycin + s-adenosyl-l-methionine = daunorubicin + s-adenosyl-l-homocysteine + h(+)
"carminomycin 4-O-methyltransferase"
"carminomycin 4-o-methyltransferase"