nocamycin E + S-adenosyl-L-methionine = nocamycin I + S-adenosyl-L-homocysteine
nocamycin e + s-adenosyl-l-methionine = nocamycin i + s-adenosyl-l-homocysteine
"nocamycin O-methyltransferase"
"nocamycin o-methyltransferase"